More than two-thirds of states overestimated their revenue projections in fiscal 2009, forcing lawmakers to reopen budgets for additional rounds of spending cuts, according to a report released Tuesday.

Driven mostly by increasing volatility in state revenue systems, the trend could get worse as states rely more on income taxes for revenue, the Pew ­Center on the States and the Nelson A. Rockefeller Institute of Government concluded in a report, “States’ Revenue Estimating: Cracks in the Crystal Ball.”

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