Year	Number
1971	308605
1973	219870
1974	206481
1975	211190
1976	208174
1977	203122
1978	215115
1979	226482
1980	221952
1981	231289
1982	236397
1983	238520
1984	214412
1985	194386
1986	168977
1987	105669
1988	111841
1989	108068
1990	117989
1991	97350
1992	90237
1993	91072
1994	87202
1995	87730
1996	91055
1997	112620
1998	87427
1999	89614
2000	81181
2001	63896
2002	59659
2003	28639
2004	18176
2005	15082
2006	18206
2007	20589
2008	19913
2009	22295
2010	21939
2013	667202