Year	Number
1971	100932
1973	102004
1974	100998
1975	109800
1976	110013
1977	92935
1978	83113
1979	62927
1980	73864
1994	65063
1995	63256
1996	56209
1997	36650
1998	35435
1999	38459
2000	30805
2001	18451
2009	37340
2010	38135
2013	44094
2014	26729
2015	28059
2016	26017
2017	30049