Year	Number
2000	13000
2001	13000
2002	14000
2003	14000
2004	15000
2005	15000
2006	16000
2007	16000
2008	17000
2009	17000
2010	18000
2011	18000
2012	19000
2013	19000
2014	20000
2015	20000
2016	21000
2017	21000
2018	22000
2019	23000
2020	24000