Year	Number
1960	156985
1961	156449
1962	155812
1963	155081
1964	154358
1965	153031
1966	151148
1967	149317
1968	147504
1969	145724
1970	144933
1971	145041
1972	145067
1973	145156
1974	145372
1975	146817
1976	147980
1977	148964
1978	150896
1979	152792
1980	154725
1981	156209
1982	160005
1983	162675
1984	163009
1985	166047
1986	168940
1987	170213
1988	171694
1989	173438
1990	175180
1991	180001
1992	181934
1993	183808
1994	185629
1995	187081
1996	188415
1997	189934
1998	191273
1999	192511
2000	193798
2001	195236
2002	196682
2003	197937
2004	199209
2005	200402
2006	201030
2007	201658
2008	202981
2009	204618
2010	205890
2011	207194
2012	209654
2013	213359
2014	218536
2015	224836
2016	231198
2017	238841
2018	248581
2019	259854
2020	266898
2021	269705
2022	276869
2023	288481