Year	Number
2000	45000
2001	41000
2002	38000
2003	36000
2004	34000
2005	31000
2006	29000
2007	28000
2008	28000
2009	27000
2010	26000
2011	25000
2012	24000
2013	24000
2014	23000
2015	21000
2016	20000
2017	19000
2018	18000
2019	17000
2020	15000