Year	Number
1970	9039
1971	9324
1972	10361
1974	12810
1976	16671
1977	18821
1978	19595
1979	22648
1980	29899
1981	34481
1982	37404
1983	41372
1984	44275
1985	45395
1986	49485
1987	51948
1988	55340
1991	52017
1992	51411
1993	56773
1994	60089
1995	64915
1996	69968
1997	74666
1998	78007
1999	81156
2000	85092
2001	88204
2002	90944
2003	93974
2004	97323
2005	99458
2006	102225
2007	104467
2008	106100
2009	108842
2010	110369
2011	111183
2012	110575
2013	104323
2014	101667
2015	99291
2016	96654
2017	94184
2018	92298
2019	89894
2020	94165
2021	79834
2022	79464