Year	Total
1971	22030
1972	25030
1973	29530
1974	26430
1975	23650
1976	26190
1977	23350
1978	25220
1979	27520
1980	26470
1981	24220
1982	21000
1983	19610
1984	25830
1985	20810
1986	21980
1987	20520
1988	22130
1989	25450
1990	26570
1991	26770
1992	29200
1993	28680
1994	28300
1995	28720
1996	29490
1997	40150
1998	45950
1999	53210
2000	59240
2001	63050
2002	67740
2003	71920
2004	87860
2005	93130
2006	102000
2007	112500
2008	133100
2009	139900