Question: What Report reported a 40% decrease in the number of armed conflicts being waged around the world once the state of geopolitical tension after World War II between powers in the Eastern Bloc and powers in the Western Bloc came to a close?
Sentence (from "Czechoslovakia–Poland relations"): Relations between the two countries were nonetheless rather amicable, but became somewhat strained in the aftermath of the rise of the Solidarity movement in Poland in 1980 and 1981, improving again afterwards.
Relevant evidence: No