Year	Number
2000	16000
2001	15000
2002	15000
2003	15000
2004	15000
2005	15000
2006	14000
2007	14000
2008	14000
2009	14000
2010	14000
2011	13000
2012	13000
2013	13000
2014	13000
2015	13000
2016	13000
2017	12000
2018	12000
2019	12000
2020	12000