Year	Number
1970	8038900
1971	8182100
1972	8165700
1973	8291400
1974	7726700
1975	7593200
1976	7809500
1977	8180100
1978	8393500
1979	8715300
1980	8680900
1981	8225900
1982	8201700
1983	8473300
1984	8979200
1985	9477100
1986	10216600
1987	10689900
1988	11260300
1989	11381300
1990	11887100
1991	11657800
1992	12051800
1993	12972400
1994	13970700
1995	14617500
1996	15313900
1997	15710500
1998	15725900
1999	16716800.000976562
2000	18011576
2001	17814539
2002	16512187
2003	17075406
2004	18940544
2005	19089737
2006	19240949
2007	19868002
2008	19310218
2009	19491081
2010	21840425.54736362
2011	22182070.189451274
2012	21922264.967187803
2013	21969443.973863408
2014	22045256.90702441
2015	22416124
2016	22988405
2017	23210633.92
2018	23547850.20835469
2019	23991370.588128358
2020	12186274.697999997
2021	15230929.136