Year	%
2008	2.96443634829966
2009	3.65846380276455
2010	3.88993974941601
2011	3.89022617345404
2012	4.26650883747211
2013	4.53258062385818
2014	4.2366463637383
2015	4.67838137015214
2016	5.15137252858059
2017	5.37401395271466
2018	5.41296527913727
2019	5.4018377559901
2020	5.3043701499748
2021	5.26284521874151