Year	Number of
2000	33000
2001	32000
2002	34000
2003	32000
2004	32000
2005	31000
2006	30000
2007	28000
2008	28000
2009	29000
2010	28000
2011	27000
2012	27000
2013	27000
2014	27000
2015	27000
2016	28000
2017	28000
2018	29000
2019	29000
2020	32000