Year	Number
1971	7150
1972	7798
1973	8518
1974	9418
1975	10418
1976	11136
1977	11661
1978	12757
1979	13374
1980	13934
1981	14303
1982	14891
1983	14873
1984	15179
1985	15799
1986	16979
1987	18448
1988	19133
1989	20265
1991	23340
1995	27922
1998	29232
2002	38204
2003	39441
2014	57946
2016	57162
2017	52598
2018	61174
2019	70057
2020	65410
2021	60951
2022	58341