Year	Number of
2000	15000
2001	15000
2002	17000
2003	15000
2004	17000
2005	18000
2006	19000
2007	19000
2008	19000
2009	19000
2010	21000
2011	19000
2012	17000
2013	16000
2014	14000
2015	11000
2016	9800
2017	8000
2018	8000
2019	6900
2020	6900