Year	Number of
2000	32000
2001	31000
2002	32000
2003	32000
2004	30000
2005	31000
2006	29000
2007	26000
2008	24000
2009	23000
2010	22000
2011	21000
2012	21000
2013	20000
2014	19000
2015	17000
2016	15000
2017	14000
2018	13000
2019	11000
2020	10000