Year	Number
1980	45791
1981	33100
1982	28748
1983	27816
1984	19711
1985	17327
1986	35931
1987	36782
1988	43573
1989	50141
1990	56667
1991	56065
1992	68181
1993	76717
1994	78912
1995	88836
1996	95724
1998	96005
1999	101467
2000	134768
2001	104905
2002	102489
2003	108085
2004	106272
2005	121302
2006	128204
2007	139367
2008	133556
2009	102266
2010	133776
2011	123881
2012	132265
2013	140832
2014	138531
2015	135591
2016	138590
2017	135144