Year	% of revenue
1991	0.013745489250116413
1992	0.013500922431878547
1993	0.017518898216557523
1994	0.017884663149801344
1995	0.009686138031520915
1996	0.014841703853087852
1997	0.01108346841681282
1998	0.015089541947485184
1999	0.016051901787165444
2000	0.029525994727721418
2001	0.010109290903309138
2002	0.008631671834419109
2003	0.002730599093441101