Year	Number
1980	4262
1981	3072
1982	3302
1983	3163
1984	3356
1985	5946
1986	4960
1987	5303
1988	5917
1989	53853
1990	51120
1991	53549
1992	56214
1993	61799
1994	67839
1995	74744
1996	81885
1997	90825
1998	93957
1999	104156
2000	97182
2001	96615
2002	98767
2003	119774
2004	130624
2005	151867
2006	157397
2007	148672
2008	157591
2009	185550
2010	202406
2011	215130
2012	227804
2013	241249
2014	236371
2015	200937
2016	289566
2017	288740
2018	283927
2019	272902
2020	254482