Year	Number
1980	25290
1983	24977
1984	28562
1985	28622
1986	29887
1987	30089
1988	30491
1989	33641
1990	34360
1991	33463
1992	33875
1993	34141
1994	33363
1995	34603
1996	36514
1997	40765
1998	42551
1999	45475
2000	49501
2001	52408
2002	51586
2003	54909
2004	54665
2005	59118
2006	61614
2007	62793
2008	60892
2009	53281
2010	54517
2011	55030
2012	55783
2013	56705
2014	60030
2015	59882
2016	58137
2017	58189
2018	59937
2019	62597
2020	61124
2021	66748