Year	%
2000	3.38871867813096
2001	3.16077057982207
2002	2.93433521450343
2003	2.68435499382286
2004	2.35517190123672
2005	2.14476776380639
2006	1.93455084209698
2007	2.09186489719229
2008	2.49688471375723
2009	2.69745248375176
2010	2.93046010500624
2011	2.6996781714745
2012	2.75900925018527
2013	2.46246948268234
2014	2.32935872832156
2015	2.19740320783212
2016	2.13539847515958
2017	1.74420161755893
2018	1.82336636266784
2019	1.73121239776876
2020	1.65369760831923