Year	Number of
1980	12744
1981	12461
1982	12069
1983	11012
1984	11045
1985	10506
1986	10840
1987	11986
1988	9348
1989	10940
1990	12416
1991	14905
1992	17000
1993	19009
1994	15583
1995	18229
1996	22201
1997	17122
1998	14756
1999	19626
2000	30840
2001	42838
2002	57012
2003	75744
2004	96662
2005	107009
2006	122472
2007	129081
2008	124037
2009	128343
2010	131590
2011	136737
2012	141170
2013	134855
2014	138352
2015	138447
2016	137551
2017	130418
2018	137972
2019	134501
2020	103373