Year	Number
1960	1807
1961	1850
1962	1898
1963	1948
1964	1993
1965	2058
1966	2122
1967	2176
1968	2211
1969	2245
1970	2301
1971	2376
1972	2455
1973	2531
1974	2608
1975	2677
1976	2740
1977	2795
1978	2840
1979	2878
1980	2923
1981	2963
1982	3007
1983	3081
1984	3169
1985	3262
1986	3355
1987	3426
1988	3482
1989	3525
1990	3541
1991	3558
1992	3602
1993	3675
1994	3769
1995	3854
1996	3900
1997	3947
1998	4027
1999	4123
2000	4207
2001	4273
2002	4358
2003	4456
2004	4550
2005	4645
2006	4695
2007	4684
2008	4665
2009	4715
2010	4890
2011	5094
2012	5255
2013	5422
2014	5604
2015	5789
2016	5962
2017	6117
2018	6260
2019	6404
2020	6556
2021	6674
2022	6801
2023	6956