Year	Total
1971	17200
1972	17200
1973	24940
1974	34390
1975	39640
1976	39470
1977	48670
1978	60880
1979	88740
1980	59330
1981	52450
1982	51590
1983	51590
1984	52450
1985	52450
1986	51590
1987	223600
1988	223600
1989	223600
1990	223600
1991	77390
1992	60190
1993	51590
1994	48150
1995	49010
1996	49010
1997	49960
1998	50990
1999	52020
2000	52540
2001	53140
2002	44450
2003	37230
2004	42390
2005	515900
2006	524200
2007	493200
2008	299700
2009	277500
2010	409800