Douglas County property taxes

Good morning IMPLAN folk, I am working on a study of tourism impacts on Doulgas County, Nebraska. It’s a study that was done several years ago and they wanted to update. As it has been a couple of years, we purchased a new data set to do the analysis. Most of the impacts have come through as expected - or with expected changes. But the two I cannot explain are property taxes and the indirect business taxes - both other taxes and S/L nontaxes. As an example, with LESS spending in the overal tourism impact in 2010 vs. the previous study (2007), property taxes for Douglas County are $50.4 million. In the previous study, property taxes were $26.6 million??!! A significant difference which is driving higher tax collections vs. lower tourism spending… Is there a way I can follow a calcuation from inputting industry data and get to a property tax calculation. Or is there a way to see the underlying assumptions that get to property taxes (and the other taxes). I do have the explanations of the tax categories that you guys always recommend referencing. But I am trying to diagnose why this is happening/what industry might be creating the higher tax numbers to be able to explain it to the client. So any light you could shed on how I can look at the study data and back out these tax streams or other answers as to why I would see differences in something like property taxes from the same geography but different data sets would be appreciated. Thanks for your help! Chris