Year	% of revenue
1986	5.023687327279905
1987	8.719299736551372
1988	6.896072297532152
1989	7.161271841879118
1990	6.405803473290833
1991	6.528180456877052
1992	8.267511951777177
1993	8.660115006634998
1994	11.45371969071391
1995	12.546119099341402
1996	9.944011038581966
1997	8.992240198813208
1998	8.636930476996392
1999	6.536274448540899
2000	8.726884291608275
2001	10.544112009620928
2002	10.65806403002899
2003	11.090004078896962
2004	10.430508354990064
2005	9.997973261328312
2006	7.866398390916574
2007	7.994761679699036