Question: In which year did this 235-acre amusement park in Kansas City, Missouri open that features the wooden roller coaster called "Timber Wolf?"

full_context: Document 1: Spinning Dragons: Spinning Dragons is a Gerstlauer spinning roller coaster at Worlds of Fun amusement park, Kansas City, Missouri. It was the second ride of its kind in the world after the Timberland Twister. The ride was built in the Orient area of the park in 2004 following the retirement of the "Orient Express". The ride was installed by Ride Entertainment Group, who handles all of Gerstlauer's operations in the Western Hemisphere.
Document 2: Oceans of Fun: Oceans of Fun is a tropically-themed water park that opened on May 31, 1982, in Kansas City, Missouri, to celebrate Worlds of Fun's 10th year anniversary. At the time it was opened it was the largest water park in the world. It is owned and operated by Cedar Fair. Oceans of Fun is adjacent to the Worlds of Fun amusement park.
Document 3: Canada's Wonderland: Canada's Wonderland is a 330 acre theme park located in Vaughan, Ontario, a suburb approximately 40 km north of Downtown Toronto. Opened in 1981 by the Taft Broadcasting Company and The Great-West Life Assurance Company as the first major theme park in Canada, it remains the country's largest. The park, currently owned by Cedar Fair, has been the most visited seasonal amusement park in North America for several consecutive years. As a seasonal park, Canada's Wonderland is open daily from May to September, with weekend openings in late April, October and early November. With sixteen roller coasters, Canada's Wonderland is ranked third in the world by number of roller coasters, after Six Flags Magic Mountain (19 coasters) and Cedar Point (17 coasters). The 330 acre park includes a 20 acre water park named Splash Works. The park holds Halloween Haunt, a Halloween-themed event, each fall, as well as special events throughout the season.
Document 4: Magic Springs and Crystal Falls: Magic Springs Theme and Water Park is an amusement park and water park located in Hot Springs, Arkansas, about 50 miles from Little Rock. A single price admission includes all day use of the rides and attractions in both parks. The park is open weekends from April through October and daily late-May through mid-August. Magic Springs Theme and Water Park was opened in 1977, closed in 1995, and reopened in 2000. Magic Springs Theme and Water Park is owned by EPR Properties and operated by Premier Parks, LLC.
Document 5: Big Bad Wolf (roller coaster): Big Bad Wolf was a suspended roller coaster in the Oktoberfest section of Busch Gardens Williamsburg. Designed by Arrow Dynamics, the roller coaster opened to the public on June 15, 1984. The ride was in service for more than 25 years before closing permanently on September 7, 2009. The footers, queue line, and station were re-purposed for Verbolten, a roller coaster that was introduced in 2012.
Document 6: Knott's Soak City: Knott's Soak City is a seasonal water park owned and operated by Cedar Fair Entertainment Company located in Buena Park, California. The Knott's Soak City name was previously used for two other water parks in Southern California, since sold to SeaWorld Entertainment and CNL Lifestyle Properties.
Document 7: Schlitterbahn Kansas City: Schlitterbahn Waterpark Kansas City is a water park that opened in summer 2009 in Kansas City, Kansas. It was announced in September 2005 by Schlitterbahn Waterparks. The 370 acre , $750 million development will include a nearly 40 acre waterpark, which will be Schlitterbahn's fourth waterpark and its first outside Texas.
Document 8: Mystic Timbers: Mystic Timbers is a wooden roller coaster located at Kings Island amusement park in Mason, Ohio. Constructed by Great Coasters International, the roller coaster opened in the park's Rivertown section on April 15, 2017. Mystic Timbers is the park's fourth wooden coaster, and its opening allowed Kings Island to reclaim the title of having the longest collection of wooden coaster track in the world with 18804 ft . During its marketing campaign, the ride's finale element in an enclosed shed was kept secret until the ride's debut. In the annual Golden Ticket Awards by "Amusement Today", it was awarded "Best New Ride" in 2017.
Document 9: Worlds of Fun: Worlds of Fun is a 235-acre amusement park in Kansas City, Missouri, United States. The park opened in 1973 and is owned and operated by Cedar Fair, which purchased the park from Hunt-Midwest in 1995. Admission to Worlds of Fun includes access to Oceans of Fun, a water park adjacent to the amusement park.
Document 10: Silver Dollar City: Silver Dollar City is a theme park in the US state of Missouri. Opened on May 1, 1960, the park is located between Branson and Branson West off of Missouri Route 76 on the Indian Point peninsula of Table Rock Lake. The park is an 1880s-themed experience that fits Branson's vision as a family-friendly vacation destination with down-home charm. Silver Dollar City's operating season runs from mid-March until late December, with the park closed during the months of January and February. Silver Dollar City is owned by the Herschend Family Entertainment.
Document 11: American Eagle (roller coaster): American Eagle is a wooden racing roller coaster located at Six Flags Great America. It was the first wooden roller coaster designed by Intamin of Switzerland and was built in 1981 by the contracting firm Figley-Wright. While the records have since been broken, American Eagle had the longest drop and fastest speed among wooden roller coasters when it debuted and is still recognized as a top racing coaster in the United States. In 2006, American Eagle celebrated its Silver Anniversary (25th Anniversary).
Document 12: Outlaw Run: Outlaw Run is a wooden roller coaster located at the Silver Dollar City amusement park in Branson, Missouri. The ride was the first wooden roller coaster manufactured by Rocky Mountain Construction and the first wooden roller coaster with multiple inversions, in which riders are turned upside-down and then back upright. The 2937 ft ride features three inversions and a top speed of 68 mph , making "Outlaw Run" the sixth-fastest wooden roller coaster in the world. The 162 ft first drop of the ride is the fourth steepest in the world among wooden roller coasters, at 81° beyond horizontal.
Document 13: Knott's Berry Farm: Knott’s Berry Farm is a 160-acre amusement park in Buena Park, California, owned by Cedar Fair. It was the twelfth most visited theme park in North America in 2015. The park features 35 rides including roller coasters, family rides, children's rides, water rides, and historical rides, and it employs about 10,000 seasonal and full-time employees.
Document 14: Wooden roller coaster: A wooden roller coaster is most often classified as a roller coaster with running rails made of flattened steel strips mounted on laminated wooden track. Occasionally, the support structure may be made out of a steel lattice or truss, but the ride remains classified as a wooden roller coaster due to the track design. Because of the limits of wood, wooden roller coasters, in general, do not have inversions (when the coaster goes upside down), steep drops, or extremely banked turns (overbanked turns). However, there are exceptions; the defunct Son of Beast at Kings Island had a 214 ft drop and originally had a 90 ft loop until the end of the 2006 season, although the loop had steel supports. Other special cases are Hades 360 at Mount Olympus Water and Theme Park in Wisconsin Dells, Wisconsin. The coaster features a double-track tunnel, a corkscrew, and a 90-degree banked turn. There is also The Voyage at Holiday World (an example of a wooden roller coaster with a steel structure for supports) featuring three separate 90-degree banked turns. Ravine Flyer II at Waldameer Park has a 90-degree banked turn, T Express at Everland in South Korea with a 77-degree drop, and Outlaw Run at Silver Dollar City which has 3 inversions and 120-degree overbanked turn.
Document 15: Timber Wolf (roller coaster): Timber Wolf is a wooden roller coaster at Worlds of Fun in Kansas City, Missouri. Timber Wolf was designed by Curtis D. Summers and was built by the Dinn Corporation. It opened in April 1989.
ground_truth: 1973