Year	Number
1971	228505
1972	257875
1973	290352
1974	311678
1975	329443
1976	362895
1977	395381
1978	421436
1979	458104
1980	484272
1981	506788
1982	498639
1983	492329
1984	457376
1985	454209
1986	462858
1987	511009
1988	527853
1989	569388
1990	597503
1991	646962
1992	652548
1994	663126
1995	762137
1996	824626
1997	859574
1998	888012
1999	953886
2000	914919
2001	945103
2002	977534
2003	975063
2004	984846
2005	996707
2006	1051872
2007	1021617
2008	1055372
2009	1224916
2010	1286653
2011	1299802
2012	1368074
2013	1412356
2014	1413208
2015	1498312
2016	1498314.5
2017	1524191
2018	1548876
2019	1584376
2020	1634441
2021	1629064
2022	1672475