Year	Number
1971	528053
1972	517494
1973	518002
1974	528074
1975	548773
1976	567331
1977	584960
1978	590268
1979	584236
1980	586230
1981	602318
1982	647100
1983	682038
1984	707729
1985	708415
1986	677387
1987	644816
1988	596965
1989	561356
1990	530993
1991	506800
1992	497771
1993	494107
1994	507617
1995	508003
1996	507238
1997	502555
1998	504046
1999	503302
2000	500946
2001	489768
2002	477865
2003	464013
2004	446610
2005	430561
2006	415858
2007	399250
2008	394246
2009	389510
2010	387969
2011	387262
2012	384834
2013	385466
2014	393020
2015	395549
2016	394433
2017	390970
2018	373837
2019	364424
2020	358766
2021	367591