Year	Number
1960	2183
1961	2128
1962	2080
1963	2038
1964	2001
1965	1972
1966	1949
1967	1928
1968	1910
1969	1895
1970	1885
1971	1869
1972	1855
1973	1846
1974	1832
1975	1811
1976	1787
1977	1765
1978	1746
1979	1728
1980	1704
1981	1692
1982	1687
1983	1673
1984	1650
1985	1617
1986	1575
1987	1528
1988	1476
1989	1421
1990	1361
1991	1300
1992	1249
1993	1209
1994	1169
1995	1131
1996	1093
1997	1054
1998	1014
1999	973
2000	931
2001	889
2002	848
2003	808
2004	771
2005	739
2006	710
2007	683
2008	659
2009	636
2010	617
2011	598
2012	580
2013	564
2014	549
2015	533
2016	515
2017	499
2018	482
2019	477
2020	466
2021	447
2022	430