Year	Number
1971	5141
1974	6397
1975	7147
1976	8315
1977	9456
1978	10272
1979	13096
1980	11849
1982	14147
1983	15941
1984	15758
1985	17789
1986	19440
1987	20305
1988	22170
1993	27730
1996	30231
1998	34223
2000	33170
2001	33866
2002	34954
2003	36123
2004	36823
2005	37422
2006	38032
2007	38768
2009	42049
2010	45905
2011	46355
2012	46533
2013	46533
2014	48286
2015	49702
2016	50455.11328125
2017	52098.875
2018	53308.44921875
2019	54146.8359375
2020	53010.04296875
2021	52821.9140625
2022	54021