Year	Number
1971	32888
1972	32470
1979	38155
1980	49622
1982	37456
1983	39291
1985	32935
1986	11854
1987	16975
1988	19526
1989	18586
1990	3450
2000	72517
2001	73823
2002	75192
2003	79580
2004	81089
2008	11188
2009	19927
2010	25514
2011	8639
2012	14744
2013	17614
2014	32595
2015	12578
2016	6482