Year	Number
1971	105683
1972	156448
1973	212339
1974	239897
1975	241843
1976	232527
1977	210940
1978	201690
1979	186620
1980	112844
1981	114435
1982	153762
1983	218195
1984	231559
1985	270675
1986	199812
1987	83455
1988	15831
1989	11837
1990	8867
1991	80853
1992	149289
1998	4378
1999	2608
2000	2383
2001	2754
2002	11445
2003	4163
2004	30430
2005	60
2006	19046
2007	97083
2008	46583
2009	77370
2010	68494
2011	68540
2012	58217
2013	4676
2014	4052
2015	2629