Year	Number
1980	46711
1981	32625
1982	32011
1983	27933
1984	31578
1985	52945
1986	76875
1987	104604
1988	81229
1989	69080
1990	63880
1991	56759
1992	47691
1993	62493
1994	57341
1995	76816
1996	69391
1997	77710
1998	78095
1999	93278
2000	108229
2001	101615
2002	94311
2003	95580
2004	94040
2005	99318
2006	95842
2007	104219
2008	121912
2009	112811
2010	127692
2011	152699
2012	151711
2013	163422
2014	157016
2015	158709
2016	166368
2017	186103