Can't speak for Grundy County, but it kind of depends on where you are coming from as to how impressed you will be with the population. Granted, Missouri is well below it's population of the 80's--particularly in the northern counties, Missouri is going to have more birds in a bad year than many states will have in a good year.
The last several years. The population has been rebounding. If we have a good hatch this Spring, we should be in good shape, relatively speaking.