Year	Total
1971	619.6
1972	683.1
1973	687.7
1974	733.1
1975	747
1976	807.8
1977	898.5
1978	862.9
1979	895.7
1980	877.9
1981	812.1
1982	788.8
1983	836.3
1984	879
1985	873.6
1986	891.4
1987	812.4
1988	831.2
1989	758.1
1990	773.2
1991	834.5
1992	815.9
1993	789.1
1994	849.1
1995	830.9
1996	877
1997	841.5
1998	764.9
1999	615.1
2000	570.7
2001	583.6
2002	585.7
2003	639
2004	680.4
2005	610.3
2006	629
2007	638.9
2008	633.2
2009	781.6