Year	% of revenue
2006	1.729537051813151
2007	1.2123562489745388
2008	1.058968055068247
2009	1.2289737291451865
2010	1.1535177750731167
2011	0.9659845979962948
2012	1.0202413484643853
2013	0.9132604752136738
2014	0.6633088096683957
2015	1.01211509884284
2016	1.0979453415426004
2017	0.9893818688237083
2018	0.8316948133659099
2019	0.7944728730145527
2020	0.8779145069812823
2021	0.9258104884690666