Year	% of revenue
1982	0.6430868167202572
1984	0.5212968849332485
1985	0.38290386008485977
1986	0.34053230576216503
1988	0.24978711325574793
1989	0.2858563261247825
1990	0.37434665913264586
1991	0.5031519287490602
1992	0.6280346210681866
1993	0.38052602126468943
1994	0.22194984596018152
1995	0.17955336101447653
1996	0.13604516699544247
1997	0.19608697546734064
1998	0.15557045505587586
1999	0.10390446642861324
2000	0.09501553632418273
2001	0.9804876842101719
2002	0.9977994885605138
2003	1.5032473095411119
2004	1.1394905470069498
2005	0.12237557086647174
2006	0.10001975570414368
2007	0.13710052838730172
2008	0.21147390797796572
2009	0.1284322211656378
2015	0.05736900405347838
2016	0.048542329205994696
2017	0.047007000435773855
2018	0.055095710803050556
2019	0.05613147290553312
2020	0.03276256567802515