Year	years
2003	2
2004	1.7
2005	1.7
2006	1.7
2007	1.7
2008	1.7
2009	1.5
2010	1.7
2011	1.8
2012	1.8
2013	1.9
2014	2.3
2015	2.3
2016	2.3
2017	2.3
2018	2.3
2019	2.3