Year	Number
1971	2242
1978	3555
1980	3880
1991	5748
1999	7663
2000	8899
2007	22263
2008	25990
2009	29308
2011	33220
2013	45778
2014	50882
2015	49262
2016	52033
2017	58364
2020	55755
2021	59522