Year	Number
1960	1204
1961	1220
1962	1250
1963	1281
1964	1313
1965	1344
1966	1376
1967	1407
1968	1440
1969	1480
1970	1520
1971	1557
1972	1593
1973	1636
1974	1684
1975	1735
1976	1787
1977	1842
1978	1905
1979	1984
1980	2072
1981	2161
1982	2244
1983	2318
1984	2391
1985	2466
1986	2528
1987	2574
1988	2620
1989	2678
1990	2740
1991	2761
1992	2733
1993	2704
1994	2690
1995	2693
1996	2710
1997	2737
1998	2787
1999	2853
2000	2930
2001	2989
2002	3011
2003	3020
2004	3042
2005	3079
2006	3130
2007	3198
2008	3281
2009	3376
2010	3473
2011	3478
2012	3387
2013	3370
2014	3179
2015	3001
2016	3016
2017	2965
2018	2943
2019	2929
2020	2942
2021	2999
2022	3076
2023	3196