Year	Number
1970	3070800
1971	3354500
1972	3415000
1973	3636500
1974	4026800
1975	4387200
1976	5101500
1977	5193400
1978	5664300
1979	6468300
1980	6969100
1981	7255200
1982	7394400
1983	7618200
1984	7991800
1985	7460400
1986	7178000
1987	7293000
1988	7551600
1989	7301700
1990	7434000
1991	6618700
1992	6719700
1993	6433300
1994	6139600
1995	6114500
1996	6751600
1997	6925200
1998	6968200
1999	6849500
2000	6492929
2001	5967306
2010	14165092.226547282
2011	17296028.46343348
2012	18073364.030062713
2013	18079383.818
2014	19361000.320880286
2015	20661772
2016	20915140
2017	23844385.43
2018	26411525.914388243
2019	27353506.86733741
2020	12330289.393000001
2021	19149959.027999997