The current Constitution of Bolivia (; literally, the Political Constitution of the State) is the 17th constitution in the country's history; previous constitutions were enacted in 1826, 1831, 1834, 1839, 1843, 1851, 1861, 1868, 1871, 1878, 1880, 1938, 1945, 1947, 1961 and 1967. The current constitution came into effect on February 7, 2009 when it was promulgated by President Evo Morales after being approved in a referendum with 90.24% participation. The referendum was held on January 25, 2009, and the constitution was approved by 61.43% of voters.