Year	% of revenue
2004	3.8944132233288213
2005	5.852387075699233
2006	2.984266237757166
2007	3.2439582323907445
2008	3.1424565475223676
2009	2.768443148562814
2010	5.174594220873082
2011	5.196520698851033
2012	6.20345837102979
2013	5.886987975202217
2014	7.157734929847481
2015	1.3947223551158692
2016	1.7496756408241105
2017	1.4908040641543718
2018	0.9649905689514904
2019	1.707986747248031
2020	1.4881897424981942
2021	0.35317194972736016
2022	0.35771356809264504