Year	Number
1973	490000
1974	431400
1975	490500
1976	453300
1977	470300
1978	544200
1979	624200
1980	613700
1981	591400
1982	621500
1983	623000
1984	741800
1985	845300
1986	852400
1987	861000
1988	1004900
1989	997400
1990	1044100
1991	1020800
1992	1051500
1993	1083100
1994	1215900
1995	1261400
1996	1252000
1997	1314700
1998	1152500
1999	1215400
2000	1331369
2001	1449980
2002	1536102
2003	1587606
2004	1650276
2005	1634473
2006	1729451
2007	1242865
2008	1224222
2009	1409414
2010	1818901.01882718
2011	2022388.57221573
2012	2195061.68029907
2013	2781708
2014	3051914.73321389
2015	3997815
2016	3815869
2017	4660739.03831114
2018	5677396
2019	6260241
2020	2984121.694
2021	3750753