Year	Number
1971	18233
1973	26139
1974	25876
1975	8816
1976	5815
1979	4677
1980	9599
1981	12107
1982	15274
1983	18476
1984	24964
1985	22822
1986	19288
1987	16965
1988	13721
1989	12212
1990	11568
1991	13093
1992	15189
1993	18050
1994	19140
1995	37374
1996	35999
1997	39413
1998	36231
1999	36925
2000	40463
2001	890
2003	9412
2004	6988
2005	2227
2006	1847
2011	22214
2012	18313
2018	1206
2019	1191
2020	5074
2021	2619
2022	2081