Year	Number
1970	23776
1971	25232
1972	26699
1975	34133
1976	35215
1977	36388
1979	40503
1980	47625
1981	51459
1982	53870
1983	54822
1984	55782
1985	58630
1986	62959
1987	68251
1988	69434
1989	72167
1990	75328
1991	80573
1992	86192
1993	87541
1994	86697
1995	88408
1996	91594
1997	96523
1998	111459
2000	120002
2001	125571
2002	129836
2003	141913
2004	148824
2005	153031
2006	154407
2007	166940
2008	178379
2009	186481
2010	190581
2011	193506
2012	198044
2013	207454
2016	208866
2017	223594
2018	227412
2019	228634
2020	226725
2021	231962
2022	232392