Year	Number of
2000	17000
2001	17000
2002	17000
2003	17000
2004	17000
2005	17000
2006	18000
2007	18000
2008	17000
2009	16000
2010	17000
2011	16000
2012	16000
2013	16000
2014	16000
2015	16000
2016	16000
2017	16000
2018	16000
2019	15000
2020	15000