Table:
text: Yugoslavian motorcycle Grand Prix
Winners of the Yugoslavian motorcycle Grand Prix
1984-1990
Year_ Track _250_cc _500_cc Report
1990 Rijeka Carlos Cardús Wayne Rainey Report
1989 Rijeka Sito Pons Kevin Schwantz Report
1988 Rijeka Sito Pons Wayne Gardner Report
1987 Rijeka Carlos Lavado Wayne Gardner Report
1986 Rijeka Sito Pons Eddie Lawson Report
1985 Rijeka Freddie Spencer Eddie Lawson Report
1984 Rijeka Manfred Herweh Freddie Spencer Report

Question: What is the year 1984-1990, winner of the Yugoslav motorcycle grand prix, 250cc under a year greater than 1984?

Question: What is the report of the winners of the 1984-1990 Yugoslav Motorcycle Grand Prix for a 250cc Sito-Pons and a 500cc Wayne-Gardner?

Question: What are the 1984-1990 winners of the 500cc Yugoslav Motorcycle Grand Prix with a 250cc Freddie Spencer among the 1968?

Question: Which track among the winners of the 1984-1990 Yugoslav Motorcycle Grand Prix has a 250cc Sito-Pons?