This line graph is designed to show the American public's self-identification on ideology. The X-axis represents years from 1972 to 2002; the Y-axis represents percent of respondents. Each line represents respondents' ideology: Liberal, Moderate, Conservative, and Don't Know. Since 1980, the "Don't Know" respondents have been declining, while Liberals and Conservatives have been increasing since the mid-seventies. Moderates dropped in the seventies and have shown little change since 1980.