Year	Number
1964	100
1965	4860
1966	4860
1967	4260
1968	4120
1969	4290
1970	4310
1971	390
1972	2300
1973	2090
1974	380
1975	380
1977	2000
1978	1980
1979	1610
1980	1681
1981	1680
1982	1645
1983	1610
1984	1576
1985	1587
1986	90
1987	129
1988	358
1989	367
1990	1822
1991	3542
1992	4355
1993	4747
1994	5021
1995	5804
1996	5784
1997	5381
1998	5353
1999	6286
2000	6801
2001	7627
2002	10758
2003	10382
2004	10474
2005	12718
2006	14079
2007	15335
2008	15007
2009	15707
2010	14771
2011	13552
2012	12569
2013	10104
2014	10156
2015	10404
2016	11060
2017	12168
2018	13512
2019	15027
2020	15523
2021	19847
2022	20865
2023	21919