Year	Number
1960	1299
1961	1299
1962	1303
1963	1322
1964	1350
1965	1386
1966	1438
1967	1490
1968	1540
1969	1596
1970	1715
1971	1858
1972	1962
1973	2032
1974	2102
1975	2160
1976	2226
1977	2308
1978	2379
1979	2441
1980	2512
1981	2597
1982	2688
1983	2774
1984	2866
1985	2963
1986	3056
1987	3150
1988	3253
1989	3369
1990	3495
1991	3624
1992	3761
1993	3919
1994	4092
1995	4261
1996	4429
1997	4605
1998	4799
1999	5018
2000	5262
2001	5530
2002	5823
2003	6131
2004	6462
2005	6883
2006	7352
2007	7798
2008	8268
2009	8728
2010	9141
2011	9552
2012	9997
2013	10478
2014	10991
2015	11406
2016	11782
2017	12138
2018	12490
2019	12853
2020	13225
2021	13515
2022	13805
2023	14166