1982 7.0 1983 13.0 1984 10.0 1985 6.0 1986 6.6 1987 6.9 1988 10.0 1989 13.0 1990 13.8 1991 14.9 1992 15.6 1993 21.0 1994 26.1 1995 31.1 1996 35.5 1997 46.4 1998 50.6 1999 76.9