Year	Number
1960	4974
1961	4893
1962	4827
1963	4728
1964	4652
1965	4509
1966	4316
1967	4163
1968	4027
1969	3950
1970	3824
1971	3571
1972	3288
1973	2972
1974	2683
1975	2455
1976	2280
1977	2149
1978	2050
1979	1975
1980	1928
1981	1886
1982	1811
1983	1745
1984	1716
1985	1705
1986	1699
1987	1683
1988	1646
1989	1608
1990	1592
1991	1568
1992	1511
1993	1447
1994	1390
1995	1332
1996	1282
1997	1258
1998	1255
1999	1251
2000	1246
2001	1224
2002	1182
2003	1138
2004	1079
2005	1013
2006	954
2007	903
2008	867
2009	840
2010	813
2011	784
2012	754
2013	727
2014	717
2015	710
2016	702
2017	697
2018	688
2019	682
2020	684
2021	696
2022	702