Year	% of revenue
1998	0.627007956420205
1999	1.2381937766712525
2000	0.8904568623016536
2002	0.7868443098520044
2003	0.6425757511296639
2004	0.7397820073978201
2005	0.625254714691517
2006	0.5185243111081324
2007	0.3129830355514166
2008	0.8409219339120123
2009	0.8759049823454738
2010	0.7829425746370997
2011	0.6525483409822377
2012	0.4896982512764152
2013	0.47772996552620595
2014	0.38714301884958024
2015	0.27641404348364207
2016	0.4316689039994289
2017	0.3738441192991111
2018	0.09517935277674479
2019	0.1957560945839806
2020	0.27590515727377385
2021	0.24561551127072032
2022	0.2037106050218766