ISLAMABAD  - Foreign investment into Pakistan fell 65.6 per cent to $680.4 million in the 2011/12 fiscal year (July-June) as direct investment dipped by half, the State Bank said on Monday.Foreign investment totalled $1.98 billion in the previous fiscal year, the State Bank of Pakistan said. Foreign direct investment fell 50.3 percent to $812.6 million in FY 2011/12, the central bank said.Pakistan’s unstable security, a Taliban insurgency in the country’s northwest and chronic power shortages have put off long-term investors, analysts say.