Year	% of revenue
1993	3.9415804256491134
1994	4.079364184127163
1995	3.2716443709604692
1996	3.383425563084632
1997	2.41961639366372
1998	2.037487480326227
1999	1.7192681004551296
2000	1.8488599242038268
2001	1.2317055499203013
2002	1.1316054018189126
2003	1.0452505590746295
2004	0.38476991985939274