In 1974, the citizens of Natrona County, Casper, Bar Nunn, Midwest, Mills, Evansville, and Edgerton voted for the One Cent Optional Tax, which allowed for one cent to be taxed on every one dollar taxable purchase within the county. Over the years, the tax has provided more than $200 million in funding for projects throughout Natrona County, including the City of Casper. While the tax has been in place for more than four decades, it is renewable every four years and must be voted on by the citizens of Natrona County.