Year	% of revenue
2010	10.208804393012777
2012	11.390438834956178
2013	10.416318062415861
2014	10.821028032450343
2015	10.966127010524833
2016	9.829758154271849
2017	10.200633274769729
2018	10.723781173877807
2019	10.217721956045022
2020	9.825136502858282
2021	9.950550655118462