Year	% of revenue
1985	6.322580645161291
1986	25.967232530596128
1987	30.42406730687516
1988	43.26034063260341
1989	40.744772271555426
1990	42.69949439437239
1991	43.820690094625164
1992	41.69091664934525
1993	49.72979210339058
1994	41.88499361909766
1995	39.362435778076616
1996	27.242211962001804
1997	20.546989907186692
1998	20.82015766267314
1999	29.707971422025036
2000	28.694348350172973
2001	30.189483706848506
2002	31.627380997388304
2003	33.003297882117614
2004	30.655346370488836
2005	30.226233700186462
2006	52.10753874858083
2007	27.77144609593323