Year	Number
1971	223926
1972	134993
1973	175106
1974	194452
1975	175541
1976	126003
1977	173962
1978	156286
1979	69392
1980	2843
1981	3755
1982	10964
1983	13566
1984	43434
1985	69384
1986	81331
1987	23012
1988	5334
1989	5338
1990	10202
1991	11864
1992	18984
1993	28491
1994	41812
1995	59487
1996	67439
1997	54616
1998	77434
1999	53237
2000	32324
2001	75052
2002	88001
2003	55017
2004	64637
2005	12558
2006	12651
2007	11445
2008	8278
2009	13933
2010	27243
2011	33870
2012	79417
2013	159634
2014	150215
2015	74115