Year	% of revenue
1990	0.5916501476596949
1991	0.5580201722800247
1992	0.6191273945662467
1993	0.6300887852379199
1994	0.7013245096998871
1995	0.6801827827091759
1996	0.522815208006907
1997	0.7839261697590263
1998	0.6371624095299783