https://www.racingsportscars.com/photo/Norisring-1987-06-28.html
24 Hours of Le Mans: June 13th & 14th, 1987
Silverstone 1,000 Kilometers: May 10th, 1987
Monza 1,000 Kilometers: April 12th, 1987
Jarama 360 Kilometers: March 22nd, 1987
Fuji 1,000 Kilometers: October 5th, 1986
Spa 1,000 Kilometers: September 15th, 1986
Nurburgring 1,000 Kilometers: August 24th, 1986
Brands Hatch 1,000 Kilometers: July 20th, 1986
Norisring 100 Miles: June 29th, 1986
It should be noted this race was part of both the Group C championship, and the ADAC Sport Auto Supercup.
https://www.racingsportscars.com/photo/Norisring-1986-06-29.html