Ventura County Assessor Dan Goodwin announced the assessment roll for 20092010 decreased by 2.34 percent this year. The assessment roll provides the basis for computing most of county government's generalpurpose tax revenue.

This year's local roll contains $104.35 billion of taxable property value, a $2.5-billion decrease from last year's total of $106.85 billion.

Tax bills based on the assessments will be issued in October.