Year	Number
1971	66285
1972	113064
1973	167772
1974	335163
1975	229526
1976	133594
1977	89053
1978	138624
1979	116058
1980	7087
1981	54301
1982	172337
1983	212538
1984	184990
1985	73513
1986	13721
1987	13812
1988	14630
1989	15169
1990	18037
1991	66273
1992	97075
1994	42870
1995	20773
1998	157805
1999	173772
2000	171651
2001	156072
2002	95378
2003	52183
2004	16441
2005	19326
2006	21247
2007	19492
2008	16694
2009	13933
2010	45382
2011	56557
2012	72890
2013	92485
2014	115680
2015	80630