Year	Number
1960	1296
1961	1374
1962	1452
1963	1531
1964	1610
1965	1694
1966	1789
1967	1898
1968	2025
1969	2164
1970	2310
1971	2466
1972	2624
1973	2789
1974	2962
1975	3134
1976	3311
1977	3482
1978	3634
1979	3756
1980	3861
1981	4010
1982	4179
1983	4297
1984	4371
1985	4405
1986	4415
1987	4436
1988	4461
1989	4461
1990	4439
1991	4424
1992	4464
1993	4580
1994	4744
1995	4936
1996	5140
1997	5368
1998	5620
1999	5883
2000	6165
2001	6484
2002	6816
2003	7139
2004	7477
2005	7828
2006	8166
2007	8498
2008	8846
2009	9225
2010	9642
2011	10109
2012	10623
2013	11169
2014	11741
2015	12352
2016	13005
2017	13690
2018	14421
2019	15189
2020	15921
2021	16560
2022	17182
2023	17914