Year	% of revenue
1985	20.559139784946236
1986	12.396367943150414
1987	15.271522053199627
1988	9.787973583594022
1989	8.64508736751647
1990	6.388217190591339
1991	5.387580845573008
1992	6.095406360424029
1993	4.702194357366771
1994	5.658358982058404
1995	6.030826523223337
1996	5.013798227458473
1997	5.984683268245676
1998	6.198503540729524
1999	5.006352975483763
2000	5.093050832508501
2001	4.446046232839063
2002	3.900693206974725
2003	3.223037398864336
2004	3.1062218511506487
2005	3.228829014928215
2006	2.0997606325836773
2007	3.34222124340069