Year	Number
1960	142317
1961	145627
1962	149204
1963	152830
1964	156422
1965	159822
1966	162949
1967	165824
1968	168546
1969	171189
1970	173767
1971	176726
1972	180166
1973	183814
1974	187718
1975	191890
1976	196317
1977	200881
1978	205381
1979	209519
1980	212991
1981	216147
1982	219142
1983	221632
1984	223611
1985	225076
1986	226031
1987	226510
1988	226550
1989	226175
1990	225456
1991	225487
1992	226338
1993	227157
1994	227918
1995	228446
1996	228705
1997	228715
1998	228538
1999	228241
2000	227890
2001	227587
2002	227438
2003	228028
2004	229351
2005	230811
2006	232481
2007	234266
2008	235911
2009	237364
2010	238592
2011	239530
2012	241354
2013	244249
2014	247078
2015	249743
2016	252228
2017	254513
2018	262031
2019	266680
2020	266812
2021	269094
2022	269916
2023	270947