Year	Total
1960	150.9
1961	157.9
1962	170
1963	184.4
1964	198.9
1965	201.4
1966	222.4
1967	241.2
1968	272.7
1969	310.4
1970	395
1971	422.9
1972	458.9
1973	541.3
1974	530.8
1975	578.6
1976	614.9
1977	676.6
1978	709.2
1979	844.9
1980	904.1
1981	1096
1982	1162
1983	1230
1984	1251
1985	1252
1986	1276
1987	1316
1988	1372
1989	1410
1990	1400
1991	1437
1992	1390
1993	1491
1994	1481
1995	1565
1996	1616
1997	1682
1998	1814
1999	2191
2000	2306
2001	2451
2002	2462
2003	2457
2004	2519
2005	2636
2006	3259
2007	3952
2008	4355
2009	4402
2010	4568