Year	Number
1970	23500
1971	24000
1972	34200
1973	42500
1974	64800
1975	74100
1976	91600
1977	105500
1978	115300
1979	120400
1980	124800
1981	142600
1982	145300
1983	143400
1984	183000
1985	185800
1986	181500
1987	190600
1988	206100
1989	193200
1990	205400
1991	215700
1992	236900
1993	227200
1994	230500
1995	262200
1996	311200
1997	194700
1998	196700
1999	135000
2000	159027
2001	164651
2002	152278
2003	155609
2004	318488
2005	320724
2006	357414
2007	357789
2008	345240
2009	330112
2010	520932.081983182
2011	599692.276092406
2012	641182.300723356
2013	576000
2014	675005.895378656
2015	682389
2016	823735
2017	892801
2018	959307.381
2019	808265
2020	425057.604
2021	348232