Year	Number
1960	30292
1961	31344
1962	32365
1963	33398
1964	34455
1965	35502
1966	36790
1967	38072
1968	39326
1969	41118
1970	44401
1971	47828
1972	50249
1973	51618
1974	52680
1975	53218
1976	53592
1977	54056
1978	54273
1979	54204
1980	54264
1981	54653
1982	55125
1983	55479
1984	55700
1985	55698
1986	55654
1987	55725
1988	55787
1989	55830
1990	56121
1991	56669
1992	57314
1993	58110
1994	59051
1995	59805
1996	60395
1997	61245
1998	62230
1999	63143
2000	64026
2001	64773
2002	65300
2003	65549
2004	65590
2005	65529
2006	65258
2007	64926
2008	64715
2009	64449
2010	64360
2011	64558
2012	64842
2013	65171
2014	65453
2015	64962
2016	64284
2017	63619
2018	62964
2019	62313
2020	61623
2021	60790
2022	59802
2023	58780