Year	Number
1970	84700
1971	97400
1972	104900
1973	96600
1974	96100
1975	99000
1976	101700
1977	111200
1978	100400
1979	93000
1980	76200
1981	129100
1982	181000
1983	200200
1984	220400
1985	225500
1986	184400
1987	217900
1988	201000
1989	220000
1990	241400
1991	212300
1992	212300
1993	197000
1994	238400
1995	250400
1996	255600
1997	89600
1998	52700
1999	140200
2000	149705
2010	1999127
2011	2279341.17952861
2012	1737962.12640656
2013	2044188
2014	2209428
2015	1929907
2016	1917924
2017	1647425
2018	1125367
2019	1066747.35619248
2020	449041.025
2021	293212.994