Year	Number
1970	1519000
1971	1659500
1972	1868100
1973	2313800
1974	2763600
1975	2936400
1976	2998800
1977	3076800
1978	3211200
1979	3783700
1980	4116000
1981	4159800
1982	4091200
1983	3951800
1984	4461400
1985	4337300
1986	3825000
1987	4386900
1988	5125900
1989	5641500
1990	5364900
1991	4818600
1992	4685000
1993	5581500
1994	5801600
1995	6395500
1996	7183100
1997	7274200
1998	6479500
1999	7403800
2000	8000757
2001	7948374
2002	8052660
2003	9159815
2004	9878598
2005	11844657
2006	12932671
2007	12870324
2008	13135437
2009	12503629
2010	15781210
2011	16407784.9571682
2012	17571565.2032155
2013	16311250
2014	17026643.2191223
2015	18882898
2016	19744932
2017	20821044
2018	24660386
2019	26211258
2020	8304771.044
2021	9321575.836