Year	% of revenue
1996	9.311392289034533
1997	10.331890007227932
1998	14.527662532865776
1999	14.44826335526298
2002	11.577699547381277
2003	8.61009819480718
2006	5.752087420936908
2008	4.799223004358661
2009	4.515480448498009
2010	4.71268629415266
2011	3.318777802213272
2012	4.722005597968546
2013	5.3451548266205675
2014	6.943998848166133
2015	6.291372177228532
2016	9.670424215185333
2017	8.853967564538635
2018	10.712352004199161
2019	9.555309553370153
2020	10.320037751994935
2021	7.3209933259318545
2022	12.945974704536015