Year	% of revenue
2001	1.6351607257769252
2002	2.4825727080516238
2003	1.7751501139306256
2007	2.083230097998467
2008	0.7790303167526195
2009	0.696189917303162
2010	0.6410470728240388
2011	0.706619909042935
2012	0.5416466545457392
2013	0.4808129105808612
2014	0.5111808510257612
2015	0.5482467630178218
2016	0.45653968302797987
2017	0.4935600475953349
2018	0.6626617406162127
2019	0.5978334198642665
2020	0.7040720497603655
2021	0.5951698390875936
2022	0.6032771490396067