Year	Number
2000	15000
2001	15000
2002	14000
2003	14000
2004	13000
2005	12000
2006	12000
2007	12000
2008	12000
2009	13000
2010	13000
2011	14000
2012	14000
2013	14000
2014	13000
2015	13000
2016	12000
2017	11000
2018	11000
2019	11000
2020	11000