Year	Total
1971	42810
1972	44400
1973	46240
1974	47530
1975	49960
1976	52100
1977	54070
1978	54030
1979	51860
1980	52590
1981	54700
1982	55150
1983	55930
1984	55680
1985	54320
1986	54020
1987	52560
1988	53510
1989	49780
1990	40830
1991	35970
1992	34470
1993	33390
1994	31710
1995	32320
1996	32820
1997	31450
1998	28810
1999	27840
2000	28280
2001	27650
2002	29110
2003	29260
2004	28360
2005	27790
2006	27920
2007	27700
2008	28930
2009	28300