UNICEF:
http://www.unicef.org/sowc96/1cinwar.htm
In the wars of the 18th, 19th and early 20th centuries, only about half the victims were civilians. In the later decades of [the 20th] century the proportion of civilian victims has been rising steadily: in World War II it was two thirds, and by the end of the 1980s it was almost 90 per cent.
(Ahlstrum, Christer, Casualties of Conflict: Report for the World Campaign for the Protection of Victims of War, Department of Peace and Conflict Research, Uppsala, 1991, pp. 8, 19.)

AFRICA RECOVERY, United Nations:
http://www.un.org/ecosocdev/geninfo/afrec/subjindx/134child.htm
Nearly 90 per cent of victims of war today are civilians, mainly women and children. Around 540 million children (one in four) "live with the ominous and ever-present hum of violence that might erupt any time," or are displaced or made refugees by ongoing conflicts. In the last decade, more than 2 million children have died as a result of armed conflicts, while 6 million others have been injured or disabled and hundreds of thousands have been conscripted into war as "soldiers, sex slaves or porters." (Africa Recovery, Vol.13 #4 (December 1999), page 3, Frehiwot Bekele)

THE NATIONAL YOUTH AGENCY:
http://www.nya.org.uk/Global-Youth/Template.asp?NodeID=91002
At the start of the 20th century more than 90 per cent of victims in wars were soldiers. By the end of the 20th century nearly 90 per cent of victims were civilians.
(Charles Macormack, Children of Conflict Forum, Winter 1999.)

NATIONAL CATHOLIC REPORTER:
http://www.findarticles.com/p/articles/mi_m1141/is_n10_v32/ai_17968576
In the 18th, 19th and early 20th centuries, civilians accounted for approximately 50 percent of deaths in wartime. In World War I that percentage dropped to 14 percent; during World War II, it rose to nearly 70 percent; and by 1990, nearly 90 percent of all victims of war were civilians. (December 29, 1995)

INTERACTION:
http://www.interaction.org/files.cgi/2835_Protection_priority.pdf
The changing nature of conflict and humanitarian emergencies has created an increasing need to articulate and prioritize the case for protecting civilians. Civilians, mostly women and children, now comprise 90 percent of all casualties in contemporary armed conflict. (April, 2004)