Year	% of revenue
2010	63.52468490113642
2011	63.37368815997917
2012	58.92615035812434
2013	64.68827100601557
2014	61.2457974536366
2015	64.46170731452318
2016	73.77643154487579
2017	67.46166312201167
2018	68.28268063100407
2019	69.75752241874214
2020	74.00640629389143
2021	61.5861705960471
2022	63.00089680705495