Year	Number
1960	51090
1961	52847
1962	54595
1963	56345
1964	58092
1965	59837
1966	61594
1967	63366
1968	65153
1969	66962
1970	68800
1971	70659
1972	72545
1973	74462
1974	76242
1975	77882
1976	79572
1977	81459
1978	87176
1979	98299
1980	106554
1981	106661
1982	106198
1983	108744
1984	111819
1985	115401
1986	119149
1987	122319
1988	121016
1989	117560
1990	115818
1991	108783
1992	99878
1993	100549
1994	104818
1995	107604
1996	110462
1997	113099
1998	116558
1999	120260
2000	124296
2001	128770
2002	133427
2003	138279
2004	142995
2005	147171
2006	150662
2007	154183
2008	157535
2009	160368
2010	163427
2011	165184
2012	167855
2013	173502
2014	180221
2015	188243
2016	198089
2017	208384
2018	218427
2019	228860
2020	237757
2021	244218
2022	250012
2023	256666