Year	Number
1960	12325
1961	12530
1962	12771
1963	13029
1964	13340
1965	13715
1966	14232
1967	14710
1968	15050
1969	15393
1970	15758
1971	16172
1972	16626
1973	17079
1974	17505
1975	17921
1976	18347
1977	18767
1978	19277
1979	20081
1980	20921
1981	21602
1982	22312
1983	23057
1984	23832
1985	24650
1986	25510
1987	26323
1988	27061
1989	27808
1990	28512
1991	29139
1992	29789
1993	30476
1994	31147
1995	31784
1996	32439
1997	33252
1998	34186
1999	35168
2000	36278
2001	37490
2002	38723
2003	39993
2004	41306
2005	42603
2006	43885
2007	45150
2008	46301
2009	47347
2010	48436
2011	49686
2012	51054
2013	52481
2014	53969
2015	55319
2016	56640
2017	58249
2018	60120
2019	62153
2020	64406
2021	66729
2022	69139
2023	71781