Year	Total
1971	17450
1972	31640
1973	31900
1974	35080
1975	35170
1976	37830
1977	23220
1978	27940
1979	37920
1980	44200
1981	42560
1982	36540
1983	21670
1984	20210
1985	22700
1986	25190
1987	34480
1988	33280
1989	46000
1990	34650
1991	28980
1992	22100
1993	41530
1994	32930
1995	35000
1996	37060
1997	35000
1998	25450
1999	33790
2000	18060
2001	16940
2002	26050
2003	25540
2004	27600
2005	37230
2006	26480
2007	26310
2008	45920
2009	25540
2010	43340