Ecuador is governed by a democratically elected president, for a four-year term. The current president of Ecuador, Guillermo Lasso, exercises his power from the presidential Palacio de Carondelet in Quito. The current constitution was written by the Ecuadorian Constituent Assembly elected in 2007, and was approved by referendum in 2008. Since 1936, voting is compulsory for all literate persons aged 18–65, optional for all other citizens.