Year	Number
1970	145300
1971	151200
1972	159800
1973	173400
1974	201400
1975	215500
1976	252000
1977	274500
1978	295700
1979	314400
1980	330000
1981	341600
1982	324500
1983	352300
1984	349000
1985	344800
1986	340700
1987	334500
1988	355500
1989	356900
1990	354400
1991	319800
1992	370600
1993	390200
1994	405800
1995	388600
1996	408400
1997	407400
1998	402500
1999	441200
2000	470300
2001	470936
2002	473898
2003	493857
2004	553147
2005	431300
2006	471714
2007	516679
2008	504211
2009	811221
2010	1065038.0107150872
2011	1093318.5607948557
2012	1159025.9385851917
2013	1222183.5
2014	1289638.767440561
2015	1375862
2016	1476812
2017	1503553.38
2018	1539592.7535301668
2019	1599362.2719999999
2020	664879.575
2021	920600.238