Year	Number
1960	1120
1961	1178
1962	1244
1963	1320
1964	1407
1965	1502
1966	1600
1967	1699
1968	1803
1969	1927
1970	2071
1971	2227
1972	2401
1973	2598
1974	2828
1975	3105
1976	3435
1977	3817
1978	4229
1979	4630
1980	4991
1981	5299
1982	5556
1983	5796
1984	6073
1985	6422
1986	6856
1987	7365
1988	7915
1989	8616
1990	9615
1991	10554
1992	10565
1993	10465
1994	10764
1995	10965
1996	11310
1997	11711
1998	12136
1999	12565
2000	13005
2001	13464
2002	13944
2003	14424
2004	14905
2005	15407
2006	15948
2007	16527
2008	17137
2009	17799
2010	18522
2011	19284
2012	20089
2013	20948
2014	21856
2015	22745
2016	23552
2017	24325
2018	25113
2019	25921
2020	26686
2021	27381
2022	28093
2023	28908