Year	%
2000	2.45260449111261
2001	2.02525492581829
2002	1.88654527792494
2003	1.74301359143511
2004	1.77305514363065
2005	1.7686023498727
2006	1.76639326670174
2007	1.63184751249252
2008	1.79029475542297
2009	1.84402442404693
2010	1.54040756923213
2011	1.27207834282251
2012	1.21781649113613
2013	1.00036900537259
2014	0.888505488956899
2015	0.876357150036727
2016	0.772794315200175
2017	0.777363027633526
2018	0.724418202079518
2019	0.602720884467534
2020	0.631742035463856