Year	Number
1960	51250
1961	56778
1962	62694
1963	65941
1964	66475
1965	67491
1966	68928
1967	70582
1968	72357
1969	73325
1970	73425
1971	73617
1972	74041
1973	74703
1974	75604
1975	76699
1976	77829
1977	78801
1978	79590
1979	80423
1980	81197
1981	81720
1982	82007
1983	82144
1984	82459
1985	82959
1986	83348
1987	83505
1988	83426
1989	83186
1990	82886
1991	82516
1992	81982
1993	81380
1994	81047
1995	81226
1996	81721
1997	82203
1998	82644
1999	83039
2000	83930
2001	85390
2002	86901
2003	88538
2004	90648
2005	93385
2006	96170
2007	98487
2008	100284
2009	101686
2010	102895
2011	104228
2012	105861
2013	107944
2014	110435
2015	113819
2016	117541
2017	121673
2018	127001
2019	133278
2020	140348
2021	147929
2022	156687
2023	167097