While the national response rate was 61.5 percent as of June 18 and the response rate for Arizona was 58.1 percent, just 1.5 percent of Navajo Nation residents had returned their forms.While the national response rate was 61.5 percent as of June 18 and the response rate for Arizona was 58.1 percent, just 1.5 percent of Navajo Nation residents had returned their forms.