Year	Number
2000	2300
2001	2100
2002	2100
2003	1900
2004	1800
2005	1700
2006	1600
2007	1500
2008	1500
2009	1400
2010	1400
2011	1300
2012	1200
2013	1200
2014	1100
2015	1100
2016	1100
2017	970
2018	970
2019	900
2020	1000