If you’re a fan of competitive races, North Carolina is the state for you.

Over the past quarter-century, the Tar Heel State has hosted the tightest Senate races, with an average 6.1-point margin of victory, according to Eric Ostermeier, author of the Smart Politics blog and a research associate at the University of Minnesota. Eight of the nine elections held in North Carolina since 1990 were won by single-digit leads, more than any other state.

“The last truly uncompetitive U.S. Senate race in North Carolina took place more than 40 years ago in 1974 when Democratic State Attorney General Robert Morgan won an open seat race against furniture executive Bill Stevens by 25.1 points,” Ostermeier writes.

Colorado was the next competitive state with an average 8.8-point margin of victory. New Jersey, Missouri, Pennsylvania and Minnesota followed, with margins of victory just under 10 points.

The least competitive state was Wyoming, where the average victory margin was 40.4 points. Since 1990, every race in that state has been won by a larger-than-single-digit lead. The same was true in eight other states. Maryland has had the longest competitive “drought,” with the last close race (one decided by a single-digit margin) held in 1970.

Ostermeier’s analysis is based on more than 450 Senate elections since 1990.