Year	Number
1970	34187
1972	64125
1975	41761
1976	37818
1977	34691
1978	29776
1979	26162
1980	21078
1981	18117
1983	17694
1984	17980
1985	16685
1986	17915
1987	14805
1988	9425
1989	4905
1992	31530
1994	17288
1996	11325
2003	5480
2007	5018
2008	9434
2009	14294
2010	13181
2011	14578
2012	15694
2016	47725
2020	47559
2021	47809
2022	47069