PDF
… population projections would be minimal. Therefore, CEDBR did not
make any adjustments for declining birth rates over the projection period.
Migration
The study applied the 2000 to 2009 migration rates from the U. S. Census Bureau, Population
Division, Cumulative Components of Population Change for Kansas, by county to estimate
migration over the forecast…
https://www.wichita.edu/about/wsunews/archive/images/Population%20forecast.pdf