Year	% of revenue
2011	25.60836384098128
2012	26.066358628026332
2013	21.331446363185098
2014	20.181824936821062
2015	21.83370402458524
2016	23.103985008339485
2017	22.318438999763103
2018	22.24569849989286
2019	22.305969553943086
2020	19.18151267386259
2022	27.62609088456983