Year	Number
2000	23000
2001	24000
2002	22000
2003	24000
2004	19000
2005	23000
2006	22000
2007	23000
2008	24000
2009	24000
2010	25000
2011	25000
2012	26000
2013	26000
2014	26000
2015	27000
2016	28000
2017	28000
2018	29000
2019	30000
2020	31000