Year	%
2000	4.615279999279901
2001	4.453042228699343
2002	4.346648797849011
2003	4.126156572112572
2004	3.952267026304517
2005	3.8107729580169427
2006	3.6219073365053194
2007	3.497519396213596
2008	3.3410192390431694
2009	3.2026896693130897
2010	3.0806950231091093
2011	2.9492745642222973
2012	2.8030734970674342
2013	2.687690976518066
2014	2.5809267421789124
2015	2.4891346516362196
2016	2.3653243612755306
2017	2.2655394824550554
2018	2.1529347478510306
2019	2.0742280205643553
2020	2.0165466169298636