PERIOD VALUE 1975 1851 1976 2856 1977 4216 1978 4585 1979 4570 1980 5609 1981 7864 1982 5821 1983 5538 1984 8317 1985 10679 1986 9583 1987 12827 1988 17081 1989 15953 1990 30 1991 5219 1992 9955 1993 13572 1994 20671 1995 24855 1996 24761 1997 29678 1998 14539 1999 9883 2000 2884 2001 397 2002 323