Year	Total
1971	26140
1972	26830
1973	28630
1974	29920
1975	30010
1976	31210
1977	32240
1978	34910
1979	37750
1980	41620
1981	43590
1982	49870
1983	54170
1984	59330
1985	58040
1986	61650
1987	61990
1988	61220
1989	61990
1990	91320
1991	93040
1992	98970
1993	108600
1994	116400
1995	122800
1996	129800
1997	134700
1998	135800
1999	138000
2000	141500
2001	171300
2002	173900
2003	196000
2004	216800
2005	243600
2006	280200
2007	291100
2008	283400
2009	303000
2010	424000