Year	Number
1965	17300
1966	17300
1967	17300
1968	17300
1969	17300
1970	23400
1971	23400
1972	23400
1973	23400
1974	23400
1975	31259
1976	32979
1977	33839
1978	35396
1979	36406
1980	37694
1981	37103
1982	37151
1983	37129
1984	38104
1985	38240
1986	38472
1987	39610
1988	40442
1989	43021
1990	44243
1991	46613
1992	47761
1993	48681
1994	50007
1995	63067
1996	77886
1997	105534
1998	133426
1999	160698
2000	212548
2001	244632
2002	275039
2003	291030
2004	313326
2005	321526
2006	356355
2007	376509
2008	143900
2009	267389
2010	277897
2011	284721
2012	284981
2013	270422
2014	260407
2015	275570
2016	251490
2017	301551
2018	278379
2019	288531
2020	307668
2021	315271
2022	330016