Year	Number
1973	59824
1974	58611
1976	36576
1977	30538
1978	18103
1980	21036
1981	18955
1984	21319
1991	8481
1994	3157
2005	1444
2006	1761
2009	2576
2010	2114
2011	3066
2012	2884
2013	3486
2014	5665
2015	8493
2016	10380