Year	Number
1971	15047
1972	15580
1973	20086
1974	23194
1975	28614
1976	35818
1977	42338
1979	49940
1981	59709
1983	61469
1984	61905
1985	62265
1986	66084
1987	62404
1988	64737
1989	66326
1990	67825
1991	72824
1992	75577
1993	73827
1994	77837
1996	78527
1998	85983
1999	82789
2000	93421
2002	104274
2003	104274
2004	103809
2007	104518
2008	111115
2011	116564
2013	120186
2014	120381
2017	121517
2018	124240