Year	Number
1960	55000
1961	53000
1962	51000
1963	50000
1964	47000
1965	47000
1966	40000
1967	34000
1968	33000
1969	30000
1970	31500
1971	29000
1972	29000
1973	20000
1974	11100
1975	16788
1976	17000
1977	17000
1978	17000
1979	32000
1980	33000
1981	35000
1982	21000
1983	35000
1984	36400
1985	36600
1986	35900
1987	22000
1988	23117
1989	25531
1990	25911
1991	24071
1992	24292
1993	24908
1994	19497
1995	31691
1996	36060
1997	36060
1998	15501
1999	16747
2000	18821
2001	12252
2002	12560
2003	12583
2004	13522
2005	15277
2006	16811
2007	17578
2008	17025
2009	15536
2010	17891
2011	22396
2012	22023
2013	25617
2014	29170
2015	35302
2016	42158
2017	42158
2018	42158
2019	61662
2020	64973
2021	74063
2022	150713
2023	167831