Year	% of revenue
1983	0.7671948809005327
1984	0.5432308579405785
1985	0.6226053639846743
1986	0.5594662142021875
1987	0.6344730348960169
1988	0.6825121235706161
1989	0.6650991803172212
1990	0.9309869795138426
1991	1.0892402737404914
1992	0.4802204389249159
1993	0.6421284031869274
1994	0.5115944451536886
1995	0.512172871349571
1996	0.832590151881327
1997	0.6805095096841738
1999	2.455248270152769
2000	0.5321487647974759
2001	0.5949144571029341
2002	0.6669763365524886
2003	0.9476950250295306
2004	0.5289165298546693
2005	0.5533628899586055
2006	0.5490546528112441
2007	0.7143830711548904
2008	0.72017452103061
2009	1.2539766087812274
2010	1.2403950359151765
2011	1.3890935135905722
2012	1.006327876615595
2013	1.854424274727426
2014	1.759999103155169
2015	1.2338834645657553
2017	1.2865776057023675
2018	1.169721033663286
2019	1.380898235991961
2020	1.135256851920864
2021	1.7566542520975519