Year	Number
1970	511400
1971	582100
1972	706600
1973	830900
1974	840800
1975	912100
1976	1060800
1977	1136600
1978	1238900
1979	1301600
1980	1284500
1981	1358100
1982	1447600
1983	1498400
1984	1514000
1985	1708000
1986	1640400
1987	1879700
1988	1964600
1989	2283800
1990	2532100
1991	2605700
1992	3024200
1993	3296900
1994	3747900
1995	4265400
1996	4718600
1997	5153900
1998	5871500
1999	6056600
2000	6641875
2001	6550376
2002	7070344
2003	6902780
2004	7619372
2005	8037890
2006	8785116
2007	9140909
2008	9140680
2009	8520740
2010	13493793
2011	14088251.6640568
2012	14518841.0529716
2013	15037454
2014	15210489
2015	14718641
2016	14724774
2017	16171640
2018	12935505
2019	46476602
2020	13285414
2021	18901048