<Table> <Tr> <Th> Election year </Th> <Th_colspan="2"> Constituency </Th> <Th_colspan="2"> PR </Th> <Th> #of seats </Th> <Th> Position </Th> <Th_colspan="2"> Presidency </Th> <Th> Note </Th> </Tr> <Tr> <Th> votes </Th> <Th>% </Th> <Th> votes </Th> <Th>% </Th> </Tr> <Tr> <Th> 1940 </Th> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> 172 / 173 </Td> <Td> Majority </Td> <Td> Manuel Ávila Camacho </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 1946 </Th> <Td> 1,687,284 </Td> <Td> 73.5 </Td> <Td> </Td> <Td> </Td> <Td> 141 / 147 </Td> <Td> Majority </Td> <Td> Miguel Alemán Valdés </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 1952 </Th> <Td> 2,713,419 </Td> <Td> 74.3 </Td> <Td> </Td> <Td> </Td> <Td> 151 / 161 </Td> <Td> Majority </Td> <Td> Adolfo Ruiz Cortines </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 1958 </Th> <Td> 6,467,493 </Td> <Td> 88.2 </Td> <Td> </Td> <Td> </Td> <Td> 153 / 162 </Td> <Td> Majority </Td> <Td> Adolfo López Mateos </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 1964 </Th> <Td> 7,807,912 </Td> <Td> 86.3 </Td> <Td> </Td> <Td> </Td> <Td> 175 / 210 </Td> <Td> Majority </Td> <Td> Gustavo Díaz Ordaz </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 1970 </Th> <Td> 11,125,770 </Td> <Td> 83.3 </Td> <Td> </Td> <Td> </Td> <Td> 175 / 210 </Td> <Td> Majority </Td> <Td> Luis Echeverría Álvarez </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 1976 </Th> <Td> 12,868,104 </Td> <Td> 85.0 </Td> <Td> </Td> <Td> </Td> <Td> 195 / 237 </Td> <Td> Majority </Td> <Td> José López Portillo </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 1982 </Th> <Td> 14,501,988 </Td> <Td> 69.4 </Td> <Td> 14,289,793 </Td> <Td> 65.7 </Td> <Td> 299 / 400 </Td> <Td> Majority </Td> <Td> Miguel de la Madrid </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 1988 </Th> <Td> 9,276,934 </Td> <Td> 51.0 </Td> <Td> 9,276,934 </Td> <Td> 51.0 </Td> <Td> 260 / 500 </Td> <Td> Majority </Td> <Td> Carlos Salinas de Gortari </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 1991 </Th> <Td> 14,051,349 </Td> <Td> 61.4 </Td> <Td> 14,145,234 </Td> <Td> 61.4 </Td> <Td> 320 / 500 </Td> <Td> Majority </Td> <Td> Carlos Salinas de Gortari </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 1994 </Th> <Td> 16,851,082 </Td> <Td> 50.2 </Td> <Td> 17,236,836 </Td> <Td> 50.3 </Td> <Td> 300 / 500 </Td> <Td> Majority </Td> <Td> Ernesto Zedillo </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 1997 </Th> <Td> 11,305,957 </Td> <Td> 39.1 </Td> <Td> 11,438,719 </Td> <Td> 39.1 </Td> <Td> 239 / 500 </Td> <Td> Minority </Td> <Td> Ernesto Zedillo </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 2000 </Th> <Td> 13,720,453 </Td> <Td> 36.9 </Td> <Td> 13,800,306 </Td> <Td> 36.9 </Td> <Td> 207 / 500 </Td> <Td> Minority </Td> <Td> Vicente Fox </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 2003 </Th> <Td> 6,166,358 </Td> <Td> 23.9 </Td> <Td> 6,196,171 </Td> <Td> 24.0 </Td> <Td> 224 / 500 </Td> <Td> Minority </Td> <Td> Vicente Fox </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 2006 </Th> <Td> 11,629,727 </Td> <Td> 28.0 </Td> <Td> 11,689,110 </Td> <Td> 27.9 </Td> <Td> 121 / 500 </Td> <Td> Minority </Td> <Td> Felipe Calderón </Td> <Td> </Td> <Td> Coalition: Alliance for Mexico </Td> </Tr> <Tr> <Th> 2009 </Th> <Td> 12,765,938 </Td> <Td> 36.9 </Td> <Td> 12,809,365 </Td> <Td> 36.9 </Td> <Td> 241 / 500 </Td> <Td> Minority </Td> <Td> Felipe Calderón </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 2012 </Th> <Td> 15,166,531 </Td> <Td> 31.0 </Td> <Td> 15,513,478 </Td> <Td> 31.8 </Td> <Td> 212 / 500 </Td> <Td> Minority </Td> <Td> Enrique Peña Nieto </Td> <Td> </Td> <Td> Coalition: Committed to Mexico </Td> </Tr> <Tr> <Th> 2015 </Th> <Td> 11,604,665 </Td> <Td> 34.2 </Td> <Td> 11,638,556 </Td> <Td> 29.2 </Td> <Td> 203 / 500 </Td> <Td> Minority </Td> <Td> Enrique Peña Nieto </Td> <Td> </Td> <Td> Coalition: Committed to Mexico </Td> </Tr> <Tr> <Th> 2018 </Th> <Td> TBD </Td> <Td> TBD </Td> <Td> TBD </Td> <Td> TBD </Td> <Td> 0 / 500 </Td> <Td> TBD </Td> <Td> TBD </Td> <Td> TBD </Td> <Td> Coalition: </Td> </Tr> </Table> <Tr> <Th> Election year </Th> <Th_colspan="2"> Constituency </Th> <Th_colspan="2"> PR </Th> <Th> #of seats </Th> <Th> Position </Th> <Th_colspan="2"> Presidency </Th> <Th> Note </Th> </Tr> <Tr> <Th> votes </Th> <Th>% </Th> <Th> votes </Th> <Th>% </Th> </Tr> <Tr> <Th> 1940 </Th> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> 172 / 173 </Td> <Td> Majority </Td> <Td> Manuel Ávila Camacho </Td> <Td> </Td> <Td> </Td> </Tr>

For many years the mexican government was a democracy dominated by a one-party system