Question

The following data points are shown: 1824-27%, 1828-58%, 1832-56%, 1836-58%, 1840-80%, 1844-78%, 1852-70%, 1856-78%, 1860-81%, 1864-73%, 1868-77%, 1872-71%, 1876-82%, 1880-79%, 1884-77%, 1888-79%, 1892-75%, 1896-79%, 1900-73%, 1904-65%, 1908-66%, 1912-59%, 1916-61%, 1920-50%, 1924-49%, 1928-57%, 1932-57%, 1936-61%, 1940-63%, 1944-56%, 1948-53%, 1952-63%, 1956-60%, 1960-63%, 1964-60%, 1968-59%, 1972-55%, 1976-53%, 1980-52%, 1984-53%, 1988-50%, 1992-55%, 1996-49%, 2000-51%, 2004-57%, 2008-62%. Of the following year spans,, which had the greatest decrease in voter turnout rates?