Year	Total
1971	825
1972	831.9
1973	838.8
1974	845.7
1975	852.7
1976	859.3
1977	865.8
1978	872.4
1979	879
1980	885.7
1981	892.2
1982	898.7
1983	905.2
1984	912
1985	919.1
1986	926.4
1987	935.1
1988	952.4
1989	958.7
1990	963.5
1991	969.5
1992	974.9
1993	991.6
1994	1006
1995	1061
1996	1086
1997	1096
1998	1124
1999	1141
2000	1192
2001	1211
2002	1259
2003	1259
2004	1256
2005	1265
2006	1231
2007	1222
2008	1230
2009	1256