Year	Number
2000	38000
2001	36000
2002	35000
2003	31000
2004	33000
2005	32000
2006	31000
2007	30000
2008	30000
2009	28000
2010	27000
2011	27000
2012	25000
2013	24000
2014	23000
2015	22000
2016	22000
2017	22000
2018	20000
2019	19000
2020	18000