Year	Number
1960	2463
1961	2530
1962	2583
1963	2634
1964	2705
1965	2793
1966	2872
1967	2966
1968	3085
1969	3235
1970	3402
1971	3489
1972	3566
1973	3632
1974	3695
1975	3761
1976	3878
1977	3997
1978	4117
1979	4241
1980	4416
1981	4533
1982	4624
1983	4706
1984	4796
1985	4884
1986	4963
1987	5036
1988	5113
1989	5196
1990	5279
1991	5306
1992	5336
1993	5432
1994	5549
1995	5668
1996	5802
1997	5971
1998	6169
1999	6363
2000	6573
2001	6813
2002	7035
2003	7258
2004	7488
2005	7702
2006	7859
2007	8024
2008	8248
2009	8484
2010	8670
2011	8936
2012	9336
2013	9735
2014	10091
2015	10426
2016	10671
2017	10956
2018	11363
2019	11746
2020	12154
2021	12550
2022	12979
2023	13475