Year	Number
1969	26800
1970	28062
1971	29601
1972	31080
1973	32273
1974	33452
1975	34670
1976	35951
1977	37263
1978	38571
1979	39887
1980	41118
1981	42257
1982	43521
1983	44815
1984	45975
1985	46995
1986	47601
1987	48109
1988	48493
1989	48561
1990	48659
1991	48698
1992	48614
1993	48647
1994	48682
1995	48601
1996	48175
1997	47379
1998	46212
1999	44888
2000	43466
2001	42213
2002	41174
2003	40254
2004	39552
2005	38948
2006	38469
2007	38041
2008	37635
2009	37329
2010	36990
2011	36453
2012	36027
2013	35881
2014	35926
2015	36209
2016	36913
2017	37709
2018	38370
2019	39001
2020	39632
2021	40120
2022	40338