Year	Number
2000	38000
2001	36000
2002	36000
2003	33000
2004	35000
2005	34000
2006	33000
2007	33000
2008	33000
2009	31000
2010	29000
2011	30000
2012	27000
2013	26000
2014	25000
2015	25000
2016	24000
2017	23000
2018	21000
2019	20000
2020	21000