Year	%
2006	2.73942939162815
2007	2.24246731582086
2008	1.90306942802894
2009	2.25042258658752
2010	2.83071715205898
2011	2.70681550509306
2012	2.81336476630545
2013	2.86654169526513
2014	3.47337431453068
2015	3.39283728404187
2016	2.69521741465076
2017	2.36889544229069
2018	1.88242856429559
2019	1.62862135995416
2020	1.57678096672626