Year	Number
1970	677
1972	701
1973	681
1976	954
1981	1063
1986	1435
1987	1580
1988	1799
1989	1909
1990	1931
1991	2256
1992	2308
1993	2190
1994	2975
1995	3046
1996	3366
1997	3303
2014	27626
2016	39437
2017	39096
2018	34274
2019	35171
2020	35027
2021	35826