Year	Total
1971	736.4
1972	757.9
1973	795.8
1974	822.1
1975	852.3
1976	888.3
1977	881.3
1978	890.2
1979	918.3
1980	906.6
1981	921.1
1982	950.9
1983	975.8
1984	1218
1985	1299
1986	1224
1987	1234
1988	1259
1989	1435
1990	1495
1991	1541
1992	1522
1993	1509
1994	1486
1995	1495
1996	1547
1997	1595
1998	1458
1999	1482
2000	1553
2001	1540
2002	1659
2003	1805
2004	1932
2005	1954
2006	2089
2007	1656
2008	1691
2009	1707