Year	Number
1960	30736
1961	31198
1962	31501
1963	31766
1964	31892
1965	31937
1966	32040
1967	32181
1968	32383
1969	32673
1970	33130
1971	33594
1972	33891
1973	34129
1974	34407
1975	34783
1976	35257
1977	35806
1978	36391
1979	36980
1980	37555
1981	38106
1982	38634
1983	39143
1984	39495
1985	39562
1986	39480
1987	39355
1988	39179
1989	38957
1990	38733
1991	39088
1992	40082
1993	41133
1994	42175
1995	43250
1996	44344
1997	45465
1998	46598
1999	47701
2000	48744
2001	49724
2002	50669
2003	51588
2004	52527
2005	53566
2006	54658
2007	55782
2008	56946
2009	58105
2010	59233
2011	60310
2012	61317
2013	62205
2014	62954
2015	63659
2016	64268
2017	64742
2018	65183
2019	65573
2020	65896
2021	66173
2022	66416
2023	66665