Context_1 : Harrah's Casino Tunica, formerly Grand Casino Tunica, was a casino and resort located in Tunica Resorts, Mississippi. It was owned and operated by Caesars Entertainment. The casino offered a 140000 sqft casino and three hotels with a total of 1,356 rooms. There was also an RV park, the Bellissimo Spa & Salon, a convention center, and a 2,500 seat entertainment venue called the Harrah's Event Center. Context_2 : Tunica County is a county located in the U.S. state of Mississippi. As of the 2010 census, the population was 10,778. Its county seat is Tunica. The county is named for the Tunica Native Americans. Most migrated to central Louisiana during the colonial period. Context_3 : Tunica Resorts, formerly Robinsonville, is an unincorporated community and census-designated place (CDP) in northern Tunica County, Mississippi, north of the county seat of Tunica. The community is situated mostly between the Mississippi River and U.S. Route 61 along the border with Arkansas. Context_4 : Rosa Fort High School (RFHS) is a senior high school in unincorporated Tunica County, Mississippi, adjacent to the North Tunica CDP, and near Tunica. It is a part of the Tunica County School District. Context_5 : The Tunica County School District is a public school district based in Tunica, Mississippi (USA). The district's boundaries parallel that of Tunica County. Context_6 : The Tunica Roadhouse Casino & Hotel is a casino, hotel and spa located in Tunica Resorts, Mississippi. It is themed to resemble a roadhouse, and is marketed as a place to "get wild", housing many features unique to Tunica casinos, such as a mechanical bull, as well as beer pong and other "bar games". The concept debuted December 18, 2009. Context_7 : Tunica Municipal Airport (IATA: KUTA) is a public use airport located one nautical mile (2 km) east of the central business district of Tunica, in Tunica County, Mississippi, United States. It is owned by the Tunica County Airport Commission. Also known as Tunica Airport, it should not be confused with the 10 acre privately owned, public use Tunica Airport (FAA LID: 30M) located 2 NM south of the center of town, which has been recently changed to Ralph M Sharpe Airport. Context_8 : Mhoon Landing is an unincorporated community located on the Mississippi River in Tunica County, Mississippi, United States. It is approximately 6 miles (9.7 km) northwest of North Tunica and approximately 12 miles (19 km) southwest of Tunica Resorts. Context_9 : The Horseshoe Casino Tunica is a casino resort located in Tunica Resorts, Mississippi. It was developed by Jack Binion, the son of Las Vegas gaming legend Benny Binion and named after his father's famous Binion's Horseshoe downtown gambling hall. Much like its namesake, the Horseshoe Tunica is known for catering to serious gamblers, particularly table games players, and is known for its liberal, player-favorable rules and its comp policies. Context_10 : Tunica is a town in and the county seat of Tunica County, Mississippi, near the Mississippi River. Until the early 1990s, the rural town was one of the most impoverished places in the United States, and its population has declined since the peak in 1970. fact_1 :  As of the 2010 census, the population was 10,778. fact_2 :  Until the early 1990s, the rural town was one of the most impoverished places in the United States, and its population has declined since the peak in 1970. Answer: 1970
Output: In what year did the population peak in Tunica, Mississippi?