Year	Number
1971	4268
1972	4352
1973	4732
1974	4539
1975	4700
1976	4824
1977	5393
1978	5269
1979	5261
1980	5324
2001	4566
2002	4565
2003	4660
2004	4803
2005	4756
2006	4518
2010	4418
2011	4320
2012	4224
2013	4175
2014	4093
2015	4040
2016	3947
2017	3760
2018	3836
2019	3708
2020	3740
2021	3840
2022	3680