Year	Number
1969	32000
1970	35000
1971	34000
1972	33000
1973	37000
1974	47000
1975	46000
1976	41010
1977	35000
1978	26390
1979	27050
1980	26460
1981	26500
1982	11500
1983	11500
1984	11500
1985	14000
1986	14000
1987	13580
1988	13578
1989	12634
1990	11735
1991	11529
1992	11515
1993	11623
1994	11903
1995	10314
1996	10430
1997	10522
1998	2259
1999	2335
2000	2383
2001	2384
2002	2428
2003	2631
2004	2898
2005	3051
2006	3132
2007	3247
2008	2824
2009	3209
2010	3257
2011	3341
2012	3468
2013	3340
2014	3473
2015	3187
2016	3267
2017	3332
2018	3442
2019	3857
2020	3965
2021	4050
2022	4094
2023	4104