My question is when did you purchase your property? If you purchased the property in 2005 then the increase would be in your 2006 taxes. The assessed value can be raised upto the purchase price. Once it is raised to the purchase price then it cannot be raised more than 3% per year unless you have done home inprovements or additions that require a building permit. In 2006 prices in all of central Florida started the decline. But again there are other issues that you did not addres in your question.
Hope this helps,
Linda J Sears
Tax assessors make mistakes all the time. There maybe a special tax assessment that you have over looked.
Check the link below
What you really need is Property Tax Counsel.
The expense is usually not that much.
Shop around a lot of attorneys do this.
HUD: Market Condition reports