Year	Number
1976	27186
1977	27042
1978	27101
1979	27236
1980	27382
1981	27261
1982	27733
1983	28006
1984	28633
1985	29228
1986	30064
1987	30258
1988	29590
1989	28664
1990	27236
1991	26661
1992	25690
1993	25013
1994	24332
1995	23720
1996	22427
1997	20426
1998	19268
1999	18339
2000	16968
2001	16266
2002	15567
2003	15461
2004	15609
2005	15666
2006	15616
2007	15336
2008	15889
2009	14623
2010	13985
2011	13658
2012	13456
2013	13250
2014	13241
2015	13044
2016	12789
2017	13042
2018	13556
2019	13819
2020	13345
2021	13066
2022	12739