Year	% of revenue
1990	14.926975945017182
1991	28.09496890898813
1992	38.0659253375695
1993	46.47482014388489
1994	65.70474281897127
1995	59.885087490206324
2003	10.957958812922818
2004	14.454348434131065
2005	15.821019524063853
2006	11.222760767624226
2007	6.982587937241576
2008	4.079343715952061
2009	6.975098173738672
2010	5.739786843770317
2011	5.388831942236633
2012	5.554907550508522
2013	4.259143788441418
2014	4.184375363770403
2015	6.28182082607575
2016	5.667068401874147
2017	5.1883524410463
2018	5.448404120878951
2019	4.7525648524956425
2020	5.574217008862659
2021	5.413625248124974
2022	4.815626447630396