Year	Number
1960	33042
1961	33827
1962	34633
1963	35591
1964	36682
1965	37761
1966	38845
1967	39946
1968	41073
1969	42236
1970	43452
1971	44726
1972	46056
1973	47446
1974	48915
1975	49517
1976	49319
1977	49330
1978	49541
1979	49969
1980	50703
1981	51846
1982	53478
1983	54107
1984	55112
1985	57747
1986	60440
1987	63247
1988	66110
1989	68988
1990	61407
1991	54516
1992	58542
1993	61621
1994	62051
1995	63303
1996	65986
1997	72456
1998	81516
1999	87513
2000	92229
2001	96447
2002	100482
2003	102674
2004	105304
2005	111550
2006	119247
2007	126475
2008	132699
2009	137809
2010	142557
2011	148111
2012	152843
2013	155631
2014	157351
2015	159009
2016	161435
2017	163897
2018	166506
2019	169278
2020	171714
2021	173509
2022	175427
2023	178429