Year	% of revenue
1996	12.145687290460225
1997	11.46987587042083
1998	7.903489784066312
1999	9.122141344873164
2000	7.435102984379766
2001	5.080372303196669
2002	5.35359340948823
2003	5.480088113337941
2004	5.507153061429807
2005	5.145668513588516
2006	4.079575632929325
2007	3.3931424736673743
2008	3.388181249446724
2009	2.0590215794451594
2010	2.3654072029911934
2011	2.2149833620071298
2012	2.044134056716303
2013	2.0873580284407103
2014	2.0680252436878885
2015	1.721218317669988
2016	1.829056449221122
2017	1.8776534109870777
2018	1.9846390359914063
2019	1.4593070460123405
2020	1.373824039226634
2021	2.0119576093108495
2022	1.9751606728999394