Year	Total
1960	13840
1961	14120
1962	14050
1963	14690
1964	15860
1965	16040
1966	16690
1967	16990
1968	17570
1969	18500
1970	19870
1971	19530
1972	20120
1973	20380
1974	21210
1975	20980
1976	21740
1977	20900
1978	20940
1979	20560
1980	19900
1981	20830
1982	22570
1983	21470
1984	22640
1985	22770
1986	24810
1987	24190
1988	25470
1989	25220
1990	25310
1991	26080
1992	27250
1993	28300
1994	29500
1995	29420
1996	30270
1997	30400
1998	30290
1999	29220
2000	28170
2001	26850
2002	27450
2003	27840
2004	28390
2005	27850
2006	27430
2007	26380
2008	26970
2009	27010
2010	28830