Year	% of revenue
2011	0.6399411868417725
2012	0.7208811425569995
2013	0.555260797734278
2014	0.583514094189583
2015	0.670157368369607
2016	0.7916748500012878
2017	0.804775396277473
2018	0.8980727479760064
2019	0.9173572560174611
2020	0.8783667358944224