Year	Number
1970	505515
1973	431863
1980	431036
1981	308972
1982	299490
1985	168429
1988	313953
1993	366699
1995	553340
1996	566250
1997	583963
1998	110394
1999	64081
2000	44731
2001	21723
2002	6192
2003	65264
2004	7259
2005	10419
2006	17312
2007	19454
2008	24091
2009	24234
2010	17199
2011	24649
2016	77700
2017	148636
2018	137484
2019	61511
2020	9053
2021	3001
2022	9176