Year	Number
1971	126147
1972	104263
1973	96985
1978	19562
1979	17707
2008	6160
2009	13180
2010	26713
2011	29846
2012	34865
2013	40594
2014	45132
2015	49507
2016	48404
2017	45540
2018	40706
2019	33549
2020	29273
2021	28577