Year	Number
1973	19338
1974	20540
1975	21202
1976	21792
1977	22214
1978	22555
1979	18483
1980	28118
1981	37773
1982	45467
1983	52502
1984	54086
1985	56067
1986	58257
1987	57120
1988	57762
1989	58362
1990	59154
1991	58436
1992	60834
1993	61506
1995	63475
1996	63718
1997	63900
1998	66583
1999	59973
2000	66440
2001	66529
2002	60869
2003	61251
2012	74355
2013	73148
2014	74129
2015	75072
2016	72408
2017	71242
2018	72512
2019	75183
2020	75960
2021	80175
2022	83734