Year	Number
1970	26184
1972	32134
1973	32720
1974	23372
1976	22372
1977	20326
1978	30545
1979	29639
1980	31678
1981	33988
1982	30666
1983	34459
1984	36253
1985	36272
1986	38826
1987	35466
1988	35414
1989	38243
1990	41764
1991	40523
1992	41923
1993	48111
1994	48985
1995	54253
1996	54689
1998	69657
1999	75233
2000	37258
2001	33375
2002	29457
2003	26068
2004	28023
2005	26394
2006	23411
2007	27493
2008	24897
2009	24684
2010	23550
2011	22698
2012	21284
2013	19527
2014	21359
2015	22238
2016	21022
2017	18639
2022	45042
2023	48185