Table:
text: Tim Mayotte
Singles performance timeline
Singles performance timeline
Tournament _1978 _1979 _1980 _1982 _1983 _1984 _1985 _1986 _1987 _1988 _1989 _1990 _1991 _1992 Career_SR
U.S. Open A 1R 1R 2R 1R 4R 4R 1R 2R 3R QF 1R 1R A 0 / 13
Grand Slam SR 0 / 0 0 / 1 0 / 2 0 / 4 0 / 4 0 / 4 0 / 3 0 / 2 0 / 2 0 / 3 0 / 3 0 / 3 0 / 2 0 / 0 0 / 35
Year End Ranking 436 420 171 30 16 44 12 15 9 10 13 37 115 1097 N/A

Question: From Tim Mayotte's singles performance timeline list, what is 1987 if 1986 is "1R"?

Question: What's 1984 when 1979 is "1R" for Tim Mayotte's singles performance timeline?