Question: yphoon Oliwa was one of a record eleven super typhoons in a season with how many Category 5 storms?

full_context: Document 1: Typhoon Gay (1989): Typhoon Gay, also known as the Kavali Cyclone of 1989, was a small but powerful tropical cyclone that caused more than 800 fatalities in and around the Gulf of Thailand in November 1989. The worst typhoon to affect the Malay Peninsula in 35 years, Gay originated from a monsoon trough over the Gulf of Thailand in early-November. Owing to favorable atmospheric conditions, the storm rapidly intensified, attaining winds of more than 120 km/h (75 mph) by 3 November. Later that day, Gay became the first typhoon since 1891 to make landfall in Thailand, striking Chumphon Province with winds of 185 km/h (115 mph). The small storm emerged into the Bay of Bengal and gradually reorganized over the following days as it approached southeastern India. On 8 November, Gay attained its peak intensity as a Category 5–equivalent cyclone with winds of 260 km/h (160 mph). The typhoon then moved ashore near Kavali, Andhra Pradesh. Rapid weakening ensued inland, and Gay dissipated over Maharashtra early on 10 November.
Document 2: 2011 North Indian Ocean cyclone season: The 2011 North Indian Ocean cyclone season was the "least active" tropical cyclone season in the North Indian Ocean since 1993. Only two cyclone storms have formed throughout the year, far below the average of 4-6. The North Indian Ocean cyclone season has no official bounds, but cyclones tend to form between April and December, with peaks in May and November. These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean. The scope of this article is limited to the Indian Ocean in the Northern Hemisphere, east of the Horn of Africa and west of the Malay Peninsula. There are two main seas in the North Indian Ocean — the Arabian Sea to the west of the Indian subcontinent, abbreviated "ARB" by the India Meteorological Department (IMD); and the Bay of Bengal to the east, abbreviated "BOB" by the IMD.
Document 3: Typhoon Keith: Typhoon Keith was the tenth of a record eleven super typhoons to develop during the unusually intense 1997 Pacific typhoon season. Originating from a near-equatorial trough on October 26, the precursor depression to Keith slowly organized into a tropical storm. After two days of gradual strengthening, the storm underwent a period of rapid intensification on October 30 as winds increased to 195 km/h (120 mph). On November 1, the storm further intensified into a super typhoon and later attained peak winds of 285 km/h (180 mph). The following day, the powerful storm passed between Rota and Tinian in the Northern Mariana Islands. After fluctuating in strength over the following few days, a steady weakening trend established itself by November 5 as the typhoon accelerated towards the northeast. On October 8, Keith transitioned into an extratropical cyclone and was last noted early the following day near the International Dateline.
Document 4: 1997 Pacific typhoon season: The 1997 Pacific typhoon season has no official bounds; it ran year-round in 1997, but most tropical cyclones tend to form in the northwestern Pacific Ocean between May and November. These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean. This was the most active tropical cyclone season ever recorded, with a record ten Category 5 storms forming and with an ACE of 594.11.
Document 5: 1966 Pacific typhoon season: The 1966 Pacific typhoon season was an active season, with many tropical cyclones having severe impacts in China, Japan, and the Philippines. Overall, there were 49 tropical depressions declared officially or unofficially, of which 30 officially became named storms; of those, 20 reached typhoon status, while 3 further became super typhoons by having winds of at least 240 km/h (150 mph). Throughout the year, storms were responsible for at least 997 fatalities and $377.6 million in damage; however, a complete record of their effects is unavailable.
Document 6: 1994 Pacific typhoon season: The 1994 Pacific typhoon season was an extremely active season in the annual cycle of tropical cyclone formation in the Western North Pacific, with a total of 32 tropical storms, where 19 of them reached typhoon strength, during the course of the season. The season had no official bounds and it ran year-round in 1994, but most tropical cyclones tend to form in the northwestern Pacific Ocean between May and November. Tropical storms that formed west of the date line were assigned a name by the Joint Typhoon Warning Center. The World Meteorological Organization-designated Regional Specialized Meteorological Centre for tropical cyclones for the region is the Japan Meteorological Agency. Tropical depressions that entered or formed in the Philippine area of responsibility were assigned a name by the Philippine Atmospheric, Geophysical and Astronomical Services Administration or PAGASA. This resulted in some storms having two names.
Document 7: Typhoon Soudelor: Typhoon Soudelor, known in the Philippines as Typhoon Hanna, was the third most intense tropical cyclone worldwide in 2015 after Hurricane Patricia and Cyclone Pam as well as the strongest tropical cyclone of the 2015 Pacific typhoon season. Soudelor had severe impacts in the Northern Mariana Islands, Taiwan, and eastern China, resulting in 40 confirmed fatalities. Lesser effects were felt in Japan, South Korea and the Philippines. The thirteenth named storm of the annual typhoon season, Soudelor formed as a tropical depression near Pohnpei on July 29. The system strengthened slowly at first before entering a period of rapid intensification on August 2. Soudelor made landfall on Saipan later that day, causing extensive damage. Owing to favorable environmental conditions, the typhoon further deepened and reached its peak intensity with ten-minute maximum sustained winds of 215 km/h (130 mph) and a central atmospheric pressure of 900 hPa (mbar; 26.58 inHg) on August 3. The Joint Typhoon Warning Center assessed one-minute sustained winds at 285 km/h (180 mph), making Soudelor a Category 5-equivalent super typhoon. Steady weakening ensued thereafter as the storm moved generally west-northwest. Soudelor made landfall over Hualien, Taiwan, late on August 7 and emerged over in the Taiwan Strait early the next day. The typhoon soon moved inland over eastern China and degraded to a tropical depression by August 9.
Document 8: 2013 Pacific typhoon season: The 2013 Pacific typhoon season was the most active Pacific typhoon season since 2004, as well as the deadliest since 1975. It was an above-average season with 31 named storms, 13 typhoons, and five super typhoons. The season's first named storm, Sonamu, developed on January 4 while the season's last named storm, Podul, dissipated on November 15. Most of the first seventeen named storms before mid-September were relatively weak, as only two of them reached the typhoon strength.
Document 9: Typhoon Oliwa: Typhoon Oliwa was one of a record eleven super typhoons in the 1997 Pacific typhoon season. It formed in the central Pacific Ocean on September 2 to the southwest of Hawaii, but it became a typhoon in the western Pacific. Oliwa explosively deepened on September 8, increasing its winds from 85 mph to 160 mph in a 24‑hour period. Afterward, it slowly weakened, and after passing east of Okinawa, Oliwa turned northeast and struck Japan with winds of 85 mph (140 km/h). There, it affected 30,000 people and killed 13; thousands of houses were flooded, and some were destroyed. Offshore South Korea, the winds and waves wrecked 28 boats, while one boat went missing with a crew of 10 people. Typhoon Oliwa dissipated on September 19 in northern Pacific Ocean near the International Date Line.
Document 10: 2002 Pacific typhoon season: The 2002 Pacific typhoon season was an active season, with many tropical cyclones affecting Japan and China. Every month had tropical activity, with most storms forming from July through October. Overall, there were 44 tropical depressions declared officially or unofficially, of which 26 became named storms; of those, there were 15 typhoons, which is the equivalent of a minimal hurricane, while 8 of the 15 typhoon intensified into super typhoons unofficially by the JTWC.
Document 11: 2010 Pacific typhoon season: The 2010 Pacific typhoon season was the least active Pacific typhoon season on record, featuring only 14 named storms; seven of them strengthened into typhoons while one reached super typhoon intensity. Very unusual, with an exceptionally low activity within the basin, the Pacific typhoon season during 2010 was much weaker compared to the Atlantic hurricane season. The last and only time that such a record like this occurred was during 2005. During the season no storms have made landfall in mainland Japan, the only second such occurrence since 1988. Also, all of the 14 named storms developed west of 150°E. Moreover, the season had an index total Accumulated Cyclone Energy (ACE) of 115, which is the second lowest in the basin after 1999. It was also the fourth consecutive year with a below average ACE index.
Document 12: Typhoon Joan (1997): Typhoon Joan of October 1997 was the longest-lasting super typhoon at the time, maintaining 1-minute maximum sustained winds of at least 240 km/h (150 mph) for 4.5 days. Joan, concurrently with Typhoon Ivan to its west, also became the strongest typhoons at the same time in the northwest Pacific Ocean. The 25th named storm during the active 1997 Pacific typhoon season, Joan developed from the same trough as Typhoon Ivan on October 11. It moved northwestward and later to the west, undergoing explosive deepening to its peak intensity on October 15. One typhoon warning agency estimated that Joan was among the strongest storms on record in the basin, and that Ivan and Joan marked the first occurrence of simultaneous super typhoons. While near peak intensity, Joan passed between Anatahan and Saipan in the Northern Marianas Islands. Later, the typhoon weakened and turned to the north and east, becoming extratropical on October 24.
Document 13: 2015 Pacific typhoon season: The 2015 Pacific typhoon season was a slightly above average season that produced 27 tropical storms, 18 typhoons, and nine super typhoons. The season ran throughout 2015, though most tropical cyclones typically develop between May and November. The season's first named storm, Mekkhala, developed on January 15, while the season's last named storm, Melor, dissipated on December 17. The season saw at least one named tropical system forming in each of every month, the first time since 1965. Similar to the previous season, this season saw a high number of super typhoons. Accumulated cyclone energy (ACE) during 2015 was extremely high, the second highest since the 1970, and the 2015 ACE has been attributed in part to anthropogenic warming.
Document 14: 1949 Pacific typhoon season: The 1949 Pacific typhoon season is an event in the annual cycle of tropical cyclone formation, in which tropical cyclones form in the western Pacific Ocean. The season runs throughout 1949, though most tropical cyclones typically develop between May and October. The scope of this article is limited to the Pacific Ocean to the north of the equator between 100°E and 180th meridian. Within the northwestern Pacific Ocean, there are two separate agencies that assign names to tropical cyclones which can often result in a cyclone having two names. The Japan Meteorological Agency  will name a tropical cyclone should it be judged to have 10-minute sustained wind speeds of at least 65 km/h (40 mph) anywhere in the basin, whilst the Philippine Atmospheric, Geophysical and Astronomical Services Administration  assigns names to tropical cyclones which move into or form as a tropical depression in their area of responsibility located between 135°E and 115°E and between 5°N–25°N regardless of whether or not a tropical cyclone has already been given a name by the JMA. Tropical depressions that are monitored by the United States' Joint Typhoon Warning Center  are given a number with a "W" suffix.
Document 15: 1977 Pacific typhoon season: The 1977 Pacific typhoon season was one of the least active Pacific typhoon seasons on record, with only 19 tropical storms forming. It was also the second of the known typhoon seasons during the satellite era (since 1960) to not produce a Category 5 equivalent super typhoon.(After the 1974 season.) The season's first storm, Severe Tropical Storm Patsy, formed on March 23 and the last, Typhoon Mary, dissipated on January 2, 1978. With Mary spanning two calendar years, it became the fourth typhoon to do so since 1945. Since then, two other typhoons have achieved this feat.
ground_truth: ten