Year	Number
1960	69808
1961	73393
1962	76624
1963	79849
1964	83504
1965	87630
1966	92303
1967	97493
1968	102704
1969	107414
1970	111540
1971	115746
1972	119801
1973	123308
1974	126949
1975	130953
1976	135372
1977	140207
1978	145075
1979	149479
1980	153155
1981	156159
1982	158695
1983	160468
1984	161636
1985	162820
1986	164056
1987	165347
1988	166554
1989	167614
1990	168433
1991	168680
1992	167509
1993	165230
1994	163055
1995	161089
1996	159475
1997	158255
1998	157058
1999	155573
2000	153804
2001	151883
2002	149970
2003	148373
2004	147495
2005	147558
2006	148465
2007	150111
2008	152409
2009	155369
2010	158937
2011	162872
2012	166830
2013	170415
2014	172922
2015	175516
2016	179300
2017	183263
2018	187489
2019	192570
2020	198631
2021	204614
2022	210608
2023	219031