Year	Number
1970	116700
1971	135600
1972	131700
1973	135600
1974	148200
1975	153800
1976	233500
1977	248800
1978	309700
1979	330400
1980	279000
1981	288800
1982	230000
1983	271400
1984	261000
1985	252600
1986	247900
1987	224400
1988	247800
1989	231900
1990	188100
1991	191700
1992	206000
1993	152400
1994	182500
1995	185900
1996	197200
1997	210600
1998	209800
1999	304100
2000	314335
2001	301135
2002	255630
2003	241111
2004	96444
2010	169030.949606142
2011	491583.034446243
2012	691271.96142731
2013	396372
2014	407544
2015	390457
2016	359516
2017	681691
2018	467624
2019	597343
2020	321437
2021	559393