Year	Total
1971	141600
1972	145900
1973	149000
1974	156500
1975	165700
1976	169800
1977	174100
1978	177500
1979	180800
1980	186900
1981	200000
1982	210700
1983	221500
1984	233200
1985	239400
1986	251200
1987	259200
1988	273000
1989	281500
1990	291800
1991	301600
1992	306200
1993	309900
1994	321100
1995	335800
1996	342300
1997	353100
1998	351900
1999	359400
2000	366400
2001	374500
2002	383600
2003	396400
2004	409500
2005	422400
2006	437900
2007	452700
2008	468300
2009	502500