Year	Number of
2000	24000
2001	24000
2002	18000
2003	15000
2004	16000
2005	18000
2006	18000
2007	19000
2008	19000
2009	18000
2010	18000
2011	18000
2012	19000
2013	18000
2014	18000
2015	18000
2016	17000
2017	18000
2018	18000
2019	15000
2020	15000