Year	% of revenue
1975	2.511431396277142
1976	1.671190140880213
1977	1.6635317039396513
1978	1.3383643409361725
1979	1.274007050977785
1980	1.3453373121282166
1981	1.4651264930864039
1982	1.4038307638194687
1983	1.3187779067208611
1984	1.1858152198370973
1985	0.798788868747637
1986	0.6260282264562314
1987	0.6790548960414022
1993	3.891281858685897
1994	4.362595453203981
1995	2.219128352612815
1996	2.1023436286285175
1997	1.856226948126536
1998	1.509483933096758
1999	1.2209836205607874
2000	0.991930601639383
2001	0.968504666463633
2002	0.9980261878105643
2003	1.0452505590746295
2004	0.38476991985939274