Year	%
2000	3.38045128072483
2001	3.34906855558355
2002	3.29094078340397
2003	2.94939903527601
2004	2.77249717173498
2005	2.58920403264852
2006	2.47356968851548
2007	2.20515261791615
2008	2.38806322207844
2009	2.10173510375679
2010	2.0448409310171
2011	1.77137519232662
2012	1.65369134689763
2013	1.62081058522944
2014	1.51368531881299
2015	1.50097276511241
2016	1.51653727288861
2017	1.46051242771208
2018	1.47806263952809
2019	1.50354925742649
2020	1.27661160623555