Year	Number
1960	13055
1961	12579
1962	12035
1963	11463
1964	10800
1965	9812
1966	8691
1967	7846
1968	7298
1969	6975
1970	6726
1971	6391
1972	5948
1973	5522
1974	5210
1975	4992
1976	4794
1977	4577
1978	4323
1979	4097
1980	3908
1981	3691
1982	3501
1983	3352
1984	3227
1985	3109
1986	3000
1987	2902
1988	2839
1989	2846
1990	2860
1991	2734
1992	2556
1993	2424
1994	2309
1995	2206
1996	2089
1997	1958
1998	1856
1999	1796
2000	1734
2001	1708
2002	1712
2003	1722
2004	1735
2005	1742
2006	1770
2007	1826
2008	1872
2009	1878
2010	1855
2011	1830
2012	1822
2013	1805
2014	1784
2015	1753
2016	1715
2017	1704
2018	1686
2019	1646
2020	1633
2021	1637
2022	1627