Year	Number
1960	33513
1961	33874
1962	34336
1963	34865
1964	35398
1965	35910
1966	36413
1967	36912
1968	37419
1969	37962
1970	38522
1971	39077
1972	39643
1973	40232
1974	40849
1975	41489
1976	42040
1977	42407
1978	42611
1979	42647
1980	42512
1981	42210
1982	41751
1983	41164
1984	40492
1985	39763
1986	38987
1987	38168
1988	37411
1989	36927
1990	36734
1991	36734
1992	36936
1993	37312
1994	37782
1995	38151
1996	38537
1997	39083
1998	39698
1999	40382
2000	41113
2001	41615
2002	42194
2003	42981
2004	43694
2005	44505
2006	45235
2007	45996
2008	47001
2009	48167
2010	49379
2011	50365
2012	51052
2013	51636
2014	52187
2015	53553
2016	55831
2017	58148
2018	60441
2019	62803
2020	64811
2021	65779
2022	66528
2023	67829