Year	Total
1971	663.1
1972	681.1
1973	685.1
1974	692
1975	699.6
1976	718.5
1977	693.7
1978	717.5
1979	736.4
1980	767
1981	784.1
1982	789.8
1983	831.7
1984	993.5
1985	1003
1986	987.3
1987	1011
1988	1009
1989	994.2
1990	1032
1991	1056
1992	1277
1993	974
1994	974.7
1995	961.5
1996	994.3
1997	1029
1998	952.5
1999	1108
2000	1279
2001	1267
2002	1414
2003	1444
2004	2089
2005	2311
2006	2516
2007	2756
2008	2670
2009	2708