Year	Number
2000	17000
2001	17000
2002	17000
2003	18000
2004	17000
2005	18000
2006	18000
2007	19000
2008	20000
2009	20000
2010	21000
2011	23000
2012	25000
2013	27000
2014	28000
2015	27000
2016	29000
2017	29000
2018	29000
2019	29000
2020	30000