Year	%
2000	4.000700905947787
2001	3.916739740710869
2002	3.8438853413121943
2003	3.7029888559609576
2004	3.6271779315817145
2005	3.5472925902619545
2006	3.4561750194306606
2007	3.4201978991382553
2008	3.3482705013965623
2009	3.282289266576947
2010	3.2344095885070465
2011	3.1118025940204097
2012	3.039938687755842
2013	2.990815071517205
2014	2.9322505097300064
2015	2.8374399202629887
2016	2.783638516931766
2017	2.7184436580036877
2018	2.649872201563604
2019	2.5868751734567055
2020	2.4626017736124277