PERIOD	VALUE
1975	5809
1976	7191
1977	7930
1978	9087
1979	10251
1980	12825
1981	16760
1982	20221
1983	23476
1984	26608
1985	26801
1986	32152
1987	36036
1988	50733
1989	59335
1990	60013
1991	54138
1992	61636
1993	58553
1994	51053
1995	42977
1996	41684