Where can I find a data set containing wetland loss by decade I am trying to find a reputable source that lists how many  acres of wetland are destroyed each year on average in each decade, specifically in the Continental US. I found some secondary sources, but many of them are conflicting, and didn't list primary sources. Are there any primary sources that list the amount of wetland destruction?
Start with US Fish and wildlife services National Wetlands Inventory site.
Site has links to :


Wetlands Mapper.
National Wetlands Inventory home page
Status and Trends web page
Download Seamless Wetlands Data