Year	Number
1985	13700
1989	20000
1990	20000
1991	20000
1992	24000
1993	24000
1994	22000
1995	29200
1996	29200
1997	29200
1998	29200
1999	29200
2000	27200
2001	29400
2002	29400
2003	29100
2004	29000
2005	29000
2007	29000
2008	29000
2009	29120
2010	29120
2011	29100
2012	29100
2013	29100
2014	29100
2015	29100
2016	29100
2017	29000
2018	29100
2019	29000
2020	24000