Year	Number
1972	56081
1973	44563
1974	37754
1979	10061
1980	12925
1981	30970
1982	38251
1983	34682
1984	45413
1985	50408
1986	44308
1987	32734
1988	30884
1989	30060
1990	34197
1991	37152
1992	28417
1993	24714
1994	13788
1995	15104
1996	2822
1997	3731
1998	5767
1999	4535
2000	7824
2001	11183
2002	14233
2003	23612
2004	23661
2005	25585
2006	26626
2007	13377
2008	9791
2009	586
2010	10
2011	10
2012	1867
2013	1432
2014	13721
2015	16900