Year	Number
1970	1335900
1971	1085600
1972	625200
1973	805200
1974	1047700
1975	1451800
1976	1947400
1977	2303700
1978	2656300
1979	2773100
1980	3029200
1981	3096800
1982	3328800
1983	3466900
1984	3641900
1985	3839400
1986	4127200
1987	4434400
1988	4889400
1989	5009000
1990	5180200
1991	5197700
1992	5680600
1993	5647100
1994	5663700
1995	5342600
1996	5375000
1997	5882500
1998	5414100
1999	5850000
2000	5293541
2001	6011849
2002	4141009
2003	4522110
2004	5097477
2005	5364134
2006	5714831
2007	5439144
2008	5605758
2009	5303268
2010	6588114
2011	7940545.07551206
2012	7973906.36067277
2013	7833901.08773203
2014	7670348.18543139
2015	8467827
2016	9628354
2017	7260769
2018	6880637
2019	7420378.249
2020	3711456.87
2021	4930661.98