Year	% of revenue
1985	11.199858004969826
1986	10.06036217303823
1987	9.165080228447103
1988	7.846534653465347
1989	13.927379387073934
1993	13.669501822600244
1994	17.301817012381413
1995	16.41011288366452
1996	14.544018256824366
1997	15.025173064820644
1998	8.819418904008828
1999	13.778512396694214
2000	13.761077632045374
2005	1.065980801896443
2006	1.1013810315712094
2007	1.2301919216792687
2008	0.4704529720203376
2009	0.40408823531272975
2010	0.2069845537377031