Year	Number
1985	12000
1989	14000
1990	11000
1991	12000
1992	11000
1993	11000
1994	11000
1995	11800
1996	11800
1997	11800
1998	11800
1999	11800
2000	11800
2001	11800
2002	11800
2003	11800
2005	12000
2006	12000
2007	12000
2008	12000
2009	12000
2010	12000
2011	12000
2012	12000
2013	12000
2014	12000
2015	22050
2016	22050
2017	26000
2018	26000
2019	28000
2020	28000