JEFFERSON CITY, Mo. (AP) — A new report uses Missouri as one of its case studies while concluding that the national growth of income inequality is having a negative effect on state tax revenues.

The report by Standard & Poor’s credit rating agency notes Missouri’s average annual tax revenue growth has declined sharply over recent decades. From the 1950s through the 1970s, Missouri averaged 9 percent annual growth. But from 2000 to 2009, it averaged just 1.8 percent growth.

During the past several decades, household incomes have risen significantly faster for the top 1 percent of people nationwide than for the median households.

The report found a correlation between income inequality and slowing tax revenues both in states that rely heavily on income taxes, such as Missouri, and those that rely more on sales taxes.