Year	%
2000	8.01117225629208
2001	7.92262174458708
2002	7.94362696356335
2003	7.99425447978586
2004	8.04574641347869
2005	7.89273432257028
2006	7.80850893918662
2007	7.75993974474322
2008	7.43811069210018
2009	6.68172793860472
2010	6.75579699011812
2011	6.60261119095194
2012	6.10254938716444
2013	5.87240535623949
2014	5.63174463786496
2015	5.41871241926295
2016	4.83773263666189
2017	4.65974512386357
2018	4.44992683560687
2019	3.95690606938588
2020	4.04956377470972