Year	years
2003	3.1
2004	3.1
2005	3.1
2006	3.1
2007	3.1
2008	3.1
2009	3.1
2010	3.1
2011	3.1
2012	3.1
2013	3.1
2014	3.1
2015	3.1
2016	3.1
2017	3.1
2018	3.1
2019	3.1