Year	Number of
2000	1700
2001	1700
2002	1600
2003	1500
2004	1400
2005	1400
2006	1200
2007	1200
2008	1200
2009	1300
2010	1400
2011	1200
2012	1300
2013	1400
2014	1400
2015	1300
2016	1300
2017	1500
2018	1300
2019	1200
2020	1200