Year	% of revenue
1995	2.2645652521906166
1996	2.8589979572456086
1997	2.41961639366372
1998	2.6931179935745395
1999	2.957505233316828
2000	1.9713724477418042
2001	1.253048534624857
2002	1.3354063724654968
2003	1.335039892466041
2004	0.7095399533163298
2008	0.5492349575788167
2009	0.45730492185520005
2010	0.9135631160935076
2011	1.4335814926475112
2012	1.2534605806819605
2013	1.0482288934055464
2014	1.120827321542543
2015	1.2171943819894024
2016	1.2119117740307666
2017	1.4486790637142524
2018	1.4508779831763023
2019	1.438980775563303
2020	1.5662481171350662
2021	0.9232517337670001