SIOUX FALLS, S.D. (MITCHELLNOW) Visitor numbers in Sioux Falls dipped this summer, with tourism down nine percent in June and six percent in July compared to last year. Experience Sioux Falls says fewer people are visiting Falls Park and other attractions, pointing to economic uncertainty and a drop in international travel. Officials warn that the decline could mean millions lost for the local economy as the fall travel season gets underway. For more Government stories from MitchellNow.com, Click Here.