Year	% of revenue
1998	1.4962814996459162
1999	1.6579328085471543
2000	1.0037104441455942
2003	0.8103273673605464
2005	2.0070785592025486
2006	1.697372145726217
2007	1.0661266126807187
2008	0.8504206988337731
2009	1.091296855333113
2010	1.1513985856964024
2011	1.1019592698602962
2012	1.0960692781985477
2013	0.9001917901020501
2014	0.8568680663039266
2015	1.014798921861309
2016	1.6573627424369504
2017	1.1569378739504044
2018	1.1427075114523069
2019	1.0429158759425454
2020	1.2692500411009948
2021	1.364542792173987
2022	1.4712144496005588