Year	% of revenue
1990	54.682130584192436
1991	52.57207461842849
1992	49.424146147736295
1993	48.47122302158273
1994	44.83633934535738
1995	55.17541568729869
2003	33.17978722786141
2004	26.854402660013736
2005	29.137736632840785
2006	24.782283169799424
2007	34.7388549431365
2008	32.282253412805225
2009	40.89952812032092
2010	10.208804393012777
2011	11.165439488045918
2012	11.716625541489217
2013	10.29281342970456
2014	10.341431428840037
2015	12.384697353719462
2016	10.974344739371437
2017	11.431629346967586
2018	11.844916768775086
2019	11.89288322362417
2020	11.274454215398228
2021	13.125789908377133
2022	0.4235698267414603