Year	Number
1971	30189
1972	31381
1973	31798
1974	32615
1975	33215
1976	33606
1977	31124
1978	29713
1979	28579
1980	27401
1981	24326
1982	23644
1983	23482
1984	24753
1985	24236
1986	25722
1992	46049
1993	45385
1996	44322
1998	46476
1999	37776
2000	43156
2001	45231
2002	48285
2003	47181
2004	49330
2005	54299
2006	50443
2007	50239
2008	59146
2010	61509
2011	66308
2012	65692
2013	69057
2014	73763
2015	67610
2016	68250
2017	66302
2018	65167
2019	61790
2020	60409
2021	62633
2022	63802
2023	65300