Year	Number of
2000	25000
2001	20000
2002	17000
2003	16000
2004	15000
2005	17000
2006	17000
2007	18000
2008	18000
2009	18000
2010	18000
2011	17000
2012	18000
2013	18000
2014	20000
2015	22000
2016	23000
2017	23000
2018	19000
2019	16000
2020	16000