Year	Number
1970	55900
1971	42000
1972	43000
1973	44500
1974	45000
1975	45000
1976	45000
1977	30000
1978	12000
1979	13000
1980	13000
1981	14500
1982	14700
1983	14000
1984	15700
1985	15800
1986	24500
1987	45000
1988	47500
1989	49600
1990	115400
1991	115400
1992	118500
1993	118500
1994	118500
1995	124500
1996	124500
1997	124500
1998	124100
1999	197200
2000	210847
2001	210847
2002	219598
2003	218652
2004	271706
2005	293442
2006	326730
2007	328326
2008	323401
2009	302596
2010	443778
2011	532707
2012	877949.881372257
2013	1476528
2014	1310124
2015	1181188
2016	1220201
2017	1196041
2018	1009414
2019	979307
2020	386950
2021	157293