Question: This rider, nicknamed "The GOAT," won his seventh AMA Motocross Championship in what year?

Context articles: James Dobb
Gatorback Cycle Park
AMA Motocross Championship
John Draper (motorcyclist)
Chuck Sun
2017 AMA National Motocross Championship
1972 AMA Motocross National Championship season
Ricky Carmichael
Broc Glover
Jeff Ward (motorsports)

James "Jamie" Dobb (born 1972 in Derby) is an English former professional motocross racer.
 Amongst his achievements, he was crowned 125cc (now MX2) Motocross World Champion in 2001, and was a top rider in the AMA motocross and supercross series during the mid-1990s.
Gatorback Cycle Park is an off-road motorcycle park located northeast of the city of Newberry, FL.
 This track has gained fame among off-road motorcycle enthusiasts and hosts several American Motorcyclist Association Motorcross events throughout the year, including the famous Mini-O's.
 It hosted a round of the AMA Motocross Championship from 1983 to 1997.
 The FIM Motocross World Championship will host the MXGP of USA at the venue.
The AMA Motocross Championship is an American motorcycle racing series.
 The motocross race series was founded and sanctioned by the American Motorcyclist Association (AMA) in 1972.
 The series is the major outdoor motocross series in the United States and is managed by MX Sports Pro Racing.
John Draper (1929 – 24 December 2002) was an English professional motorcycle racer.
 He was a versatile rider competing in many diverse motorcycle competitions, most notably motocross in which he became the third British rider to win the European Motocross Championship in 1955.
 Draper also competed in trials, enduro and road racing competitions.
 He was a member of four victorious British Motocross des Nations teams in 1950, 1953, 1956 and 1959.
Chuck Sun (born September 10, 1956 in Sherwood, Oregon) is a former professional motocross racer.
 In 1980, Sun won the AMA 500cc National Motocross Championship.
 He is the only Asian American to have won a national championship in American professional motorcycle racing.
 In 2003, Sun was inducted into the AMA Motorcycle Hall of Fame.
The 2017 AMA Motocross Championship season is the 45th AMA Motocross National Championship season, the premier motocross series in USA.
 Ken Roczen goes into the season as the defending champion in the 450 class after taking his second national title in 2016.
 In the 250 class Cooper Webb is the defending champion after taking his maiden title last season.
The 1972 AMA Motocross Championship season was the 1st AMA Motocross National Championship season.
Ricky Carmichael (born November 27, 1979 in Clearwater, Florida) is a motor racer known for his success in motocross in the early 2000s, having won the AMA Motocross Championship 450cc class seven times and the AMA Supercross Championship 450cc class five times.
 His unrivaled successes in the sport of motocross have given him the nickname "The GOAT"; standing for Greatest of All Time.
Broc Glover (born May 16, 1960 in San Diego, California) is an American former professional motocross racer in the 1970s and early 1980s.
 Glover earned six AMA National Motocross Championships, a record which stood for nearly 20 years until 2003, when Ricky Carmichael finally eclipsed the mark.
 Glover won all of his titles riding for Yamaha.
Jeff Ward (born 22 June 1961) is a British-American former professional motocross racer, auto racing driver and off-road racer.
 He won the AMA Motocross Championship five times and the AMA Supercross Championship twice and the Motocross des Nations seven times.
 After retiring from motorcycle competition, Ward turned to auto racing, finishing in second place at the Indianapolis 500 and winning a race at the Texas Motor Speedway.
 He then competed in off-road truck racing and is currently competing in rallycross racing.
 Ward was inducted into the Motorcycle Hall of Fame in 1999 and, was inducted into the Motorsports Hall of Fame of America on August 12, 2006.