Year	Number of
2000	1400
2001	1400
2002	1500
2003	1600
2004	1700
2005	1800
2006	1700
2007	1900
2008	1900
2009	2000
2010	2000
2011	2200
2012	2300
2013	2300
2014	2300
2015	2200
2016	2400
2017	2500
2018	2700
2019	2600
2020	2700