Property values have decreased across most of Newton County, but property tax bills may not decrease in 2009.Chief Tax Assessor Tommy Knight said more than 95 percent of residential properties in the county have decreased in value from 2008, with areas losing anywhere from a few percent to more than 30 percent of their value. The county revalues property every year and the 2009 property value assessments will be mailed to residents on April 15.However, the Georgia House of Representatives recently voted not to include the Homeowner Tax Relief Grant in the state’s 2010 fiscal year budget and