Year	% of revenue
1985	9.634408602150538
1986	13.797868140544809
1987	9.220701963117191
1988	2.0507473062217585
1989	7.6596963620739045
1990	8.168828313915148
1991	7.824895657437793
1992	7.404905425067554
1993	5.506086889628248
1994	6.013062082426244
1995	6.6049446570807895
1996	11.532133948946559
1997	12.81508343054217
1998	8.55676301607803
1999	9.906475869107876
2000	8.554404602071717
2001	9.222094865174135
2002	8.66585016840027
2003	10.131619889225574
2004	7.871094439022095
2005	7.584391398173215
2006	4.71519332789464
2007	7.015561183859573