Year	% of revenue
1997	1.548531944846456
1998	1.1050866148968432
1999	1.197124334039412
2000	1.072468943278088
2001	0.786456648413573
2002	0.9376003816058119
2003	0.8103273673605464
2004	1.0139185712103715
2005	1.361393099925361
2006	2.0105459482808357
2007	0.7604084761512732
2008	1.614882357802641
2009	1.5903455943819738
2010	1.6960895787082895
2011	1.7201118878996449
2012	1.3756314192880632
2013	1.488613686447311
2014	0.970897120523651
2015	0.9762364869294142
2016	0.6817992441880414
2017	0.7988736836353418
2018	0.6537158635598781
2019	0.7528602311369325
2020	0.8666288858583936
2021	0.7770209018622601
2022	0.7816611064847219