1971, 1972, 1973, 1974, 1975, 1976, 1977,
 1978, 1979, 1980, 1981, 1982, 1983, 1984,
 1985, 1986, 1987, 1988, 1989, 1990, 1991,
 1992, 1993, 1994, 1995, 1996, 1997, 1998.