Year	Number
1970	345800
1971	380500
1972	393000
1973	405000
1974	388300
1975	391300
1976	396000
1977	410000
1978	425000
1979	460000
1980	481000
1981	500000
1982	515000
1983	517000
1984	487000
1985	509000
1986	511000
1987	512000
1988	516000
1989	308000
1990	318500
1991	318500
1992	318500
1993	318500
1994	318500
1995	334500
1996	334500
1997	334500
1998	333200
1999	536800
2000	437600
2001	398216
2002	1186162
2003	1117208
2004	1392244
2005	1503624
2006	1620895
2007	1662866
2008	1637923
2009	1527346
2010	924207
2011	1539676
2012	1663425.4345762
2013	1572120
2014	1926969
2015	2095503
2016	2741388
2017	3149037
2018	3407788.43290303
2019	3701663.849
2020	1506581.713
2021	1132655.764