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