Year	Number
1970	704
1971	1319
1972	5
1973	8
1974	448
1975	677
1976	413
1977	1211
1978	704
1979	925
1980	929
1981	931
1982	1142
1983	1695
1984	248
1985	606
1986	1729
1987	309
1988	396
1989	1462
1990	2017
1991	5794
1992	6380
1994	1969
1995	82
1996	935
1997	1474
2013	2264
2014	3379
2015	4386
2016	4575
2017	4918
2018	5066
2019	3851
2020	5130
2021	5306