Year	Number
1971	32247
1972	33351
1973	33993
1974	35419
1975	36151
1977	30799
1978	28595
1979	32650
1980	33077
1981	33958
1982	34248
1983	37098
1984	37356
1999	39267
2000	38776
2001	37925
2002	39276
2003	41555
2004	41953
2005	41982
2006	43840
2007	44170
2008	42991
2009	43319
2010	43076
2011	44493
2012	44843
2013	42578
2014	42085
2016	40768
2017	40018
2018	39691
2019	39860
2020	40698
2021	41677
2022	42047