1973 Mexican legislative election
Results

Party
Votes
%
Seats
+/-
Institutional Revolutionary Party
10,458,618
77.4
189
+11
National Action Party
2,207,069
16.3
25
+5
Popular Socialist Party
541,833
4.0
10
0
Authentic Party of the Mexican Revolution
272,339
2.0
7
+2
Non-registered candidates
36,858
0.3
0
0
Invalid/blank votes
1,493,267
–
–
–
Total
15,009,984
100
231
+18
Source: Nohlen
Source: Nohlen
Source: Nohlen
Source: Nohlen
Source: Nohlen

Question: What proportion of seats did the Institutional Revolutionary Party win in the 1973 election?
Answer: The Institutional Revolutionary Party won 189 of the 231 seats.