Year	Total
1971	342.3
1972	339.1
1973	342.4
1974	366.4
1975	380
1976	404.9
1977	441.8
1978	486.9
1979	499
1980	527.3
1981	568.4
1982	568.1
1983	539.4
1984	593.9
1985	604
1986	605.1
1987	599.6
1988	610
1989	612.4
1990	612.3
1991	602.6
1992	623.6
1993	662.6
1994	650.9
1995	604.2
1996	701.3
1997	704
1998	643.1
1999	730.3
2000	755.5
2001	678
2002	737.7
2003	688.6
2004	752.6
2005	735.4
2006	750.8
2007	695.2
2008	697.9
2009	666.2