Year

PRI candidate gets…(%)

PRI seats in Chamber of Deputies/total seats

1917

Carranza 97.9 (Liberal Constitutionalist)

1920

Obregón (Laborist) 95.8

1924

Calles (Laborist) 84.1

1928

Obregón (Laborist) 100
(assassinated 16 days later). Emilio Portes Gil becomes interim president. Calles is power behind the throne.

1929

Pascual Ortiz Rubio (PNR) 93.6

1934

98.2

1940

93.9

172/173

1946

77.9

141/147

1952

74.3

151/161

1958

90.4

153/162

1964

88.8

175/210

1970

86

178/213

1976

100

195/237

1982

74.3

299/400

1988

50.7

260/500

1994

48.7

300/500

2000

36.1

207/500

2006

35.9

106/500

2012

38.2

212/500

2018

16.9

69/500