Year	Total
1971	37770
1972	37940
1973	40360
1974	42780
1975	45210
1976	49030
1977	54060
1978	58660
1979	66480
1980	73170
1981	80930
1982	87190
1983	91140
1984	103000
1985	109500
1986	112600
1987	112300
1988	116900
1989	114600
1990	114500
1991	116900
1992	115000
1993	123000
1994	128300
1995	134800
1996	135000
1997	143400
1998	145000
1999	145000
2000	145600
2001	144900
2002	143800
2003	153400
2004	157600
2005	157900
2006	157400
2007	158800
2008	162000
2009	160600