Year	Number
1970	145800
1971	125200
1972	115400
1973	103300
1974	75700
1975	70300
1976	69200
1977	63500
1978	69300
1979	70100
1980	65500
1981	69400
1982	157900
1983	158800
1984	133300
1985	124100
1986	123900
1987	118200
1988	118600
1989	127000
1990	116900
1991	124500
1992	147100
1993	167200
1994	181500
1995	193700
1996	195200
1997	224800
1998	234700
1999	208600
2000	199370
2001	190465
2002	179994
2003	171933
2004	153204
2005	162095
2006	175006
2007	185872
2008	187382
2009	196298
2010	226094
2011	237570.829047845
2012	254059.928996848
2013	304365.908
2014	349864.363
2015	368947
2016	366188
2017	355039
2018	358874
2019	371985
2020	139029.18
2021	273874