Year	% of revenue
1991	0.6968068005951267
1993	3.8409832917226807
1994	7.075767063243582
1995	2.1736914530350133
1996	2.06436141877326
1997	1.7976145644644508
1998	1.4987500400628184
1999	1.218909918774984
2000	0.8964217623788276
2001	0.8815872528447378
2002	0.8322361967984945
2003	0.8776863975697512
2004	0.4362591667820377