Year	Number of
2000	1900
2001	2000
2002	1800
2003	1800
2004	1700
2005	1900
2006	1900
2007	1800
2008	1900
2009	2000
2010	1900
2011	1900
2012	1700
2013	1700
2014	1800
2015	1700
2016	1800
2017	1800
2018	1900
2019	1900
2020	2000