Year	Number
2000	28000
2001	29000
2002	30000
2003	28000
2004	28000
2005	28000
2006	26000
2007	25000
2008	24000
2009	22000
2010	21000
2011	20000
2012	18000
2013	16000
2014	15000
2015	14000
2016	12000
2017	12000
2018	11000
2019	11000
2020	10000