Year	Number of
2000	2700
2001	2700
2002	2500
2003	2400
2004	2200
2005	2100
2006	2100
2007	2000
2008	1900
2009	1800
2010	1700
2011	1600
2012	1500
2013	1500
2014	1500
2015	1500
2016	1400
2017	1400
2018	1300
2019	1300
2020	1400