Year	% of revenue
1994	10.201922132225464
1995	9.91579468763544
1996	10.26093515354012
1997	8.753836957103061
1998	7.973374109881516
1999	6.801869666078394
2000	5.977522484037145
2001	5.687498472186356
2002	6.861416154142515
2003	6.460796009109641
2004	6.688269026334046
2005	5.777496718010699
2006	5.302446160070129
2007	5.216545241302004
2008	5.081751898276448
2009	4.372181972393561
2010	4.123351397900426
2011	4.399771436881252
2012	4.300329319544983
2013	4.1249883008171295
2014	3.741082044734059
2015	3.552493602577572
2016	3.4107693131841788
2017	3.2739262658272157
2018	3.359628067107416
2019	3.3424855707171743
2020	2.9954037347402664
2021	3.265553902901971
2022	3.0219276337659915