Year	Number of
2000	1300
2001	1100
2002	1200
2003	1300
2004	1300
2005	1500
2006	1600
2007	1500
2008	1400
2009	1400
2010	1200
2011	1100
2012	1100
2013	960
2014	970
2015	950
2016	950
2017	920
2018	940
2019	940
2020	960