Tokyo, July 30 (BridgeNews) - Japan's Nikkei 225 Stock Average slumped 1.9% Monday to end at the lowest closing level since January 7, 1985. The victory by the nation's ruling Liberal Democratic Party at Sunday's House of Councillors election did little to curb the tumble, led by high tech shares, as investors awaited the government's concrete outline for further structural reform measures, traders said. The Nikkei 225 Stock Average fell 218.81 points to 11,579.27.