Year	% of revenue
1990	7.210031347962382
1991	9.657534246575343
1992	13.324372371330703
1993	15.528950295650137
1994	20.63841259570797
1995	12.989869574646054
1996	12.259694461623486
1997	10.420962295063696
1998	9.822520083828152
1999	10.32727947008952
2001	9.769259567007863
2002	10.091042673190236
2003	8.749483755506608
2004	6.864719704598858
2005	6.524998828545991
2006	17.79064228923167
2007	14.3839795508654
2008	4.289628398783766
2009	2.898071163794006
2010	2.612860390531956
2011	2.5875650522382907
2012	2.8893485197159805
2013	2.829069636835558
2014	3.0107267564388
2015	3.6854242215092112
2016	4.126097380109371
2017	4.59660538983931
2018	4.961557894322891
2019	5.165304221501358
2020	4.489922522318574
2021	7.635870983971834
2022	12.792181101012792