Year	% of revenue
1985	60.12903225806452
1986	35.698776154757205
1987	30.347582221466812
1988	35.55092109836636
1989	35.34230879404182
1990	34.58342492855573
1991	36.98983655653614
1992	39.017356059031385
1993	34.99817297151759
1994	43.358231364011715
1995	45.01741319264853
1996	50.20564665923685
1997	53.73028351169042
1998	52.911637643076645
1999	43.75117165531463
2000	50.420909242363365
2001	48.64667469047935
2002	47.781456398902264
2003	45.56258774319
2004	45.30627124025447
2005	48.20846463659702
2006	33.11541354856686
2007	49.30806143239991