Year	Number
1960	7949
1961	8430
1962	9036
1963	9766
1964	10635
1965	11659
1966	12862
1967	14263
1968	15867
1969	17677
1970	19938
1971	22458
1972	24798
1973	26963
1974	28976
1975	30867
1976	32656
1977	34353
1978	35974
1979	37558
1980	39158
1981	40823
1982	42549
1983	44281
1984	45948
1985	47502
1986	49325
1987	51485
1988	53572
1989	55515
1990	57340
1991	59066
1992	60711
1993	62273
1994	63731
1995	65063
1996	66220
1997	67674
1998	69639
1999	71756
2000	73970
2001	76269
2002	78907
2003	81554
2004	84865
2005	88110
2006	89563
2007	93399
2008	101386
2009	108678
2010	115234
2011	124108
2012	134568
2013	145716
2014	155644
2015	164106
2016	174398
2017	183881
2018	190331
2019	200925
2020	207779
2021	207581
2022	208523
2023	208572