Statistical summary

Majoritarian System and Centralized Control: 12/18 = 66%
Majoritarian System and Diffuse Control: 4/18 = 22%
Majoritarian System and Mixed Control: 2/18 = 11%
Proportional System and Centralized Control: 2/11 = 18%
Proportional System and Diffuse Control: 2/11 = 18%
Proportional System and Mixed Control: 6/11 = 54%
Proportional System and Without Constitutional Control: 1/11 = 9%
Mixed System and Centralized Control: 3/6 = 50%
Mixed System and Diffuse Control: 2/6 = 33%
Mixed System and Mixed Control: 1/6 = 17%
Majoritarian and Nomination System and Centralized Control: 13/17 = 76%
Majoritarian and Nomination System and Diffuse Control: 4/17 = 23%
Proportional and Nomination System and Centralized Control: 5/7 = 71%
Proportional and Nomination System and Diffuse Control: 2/6 = 33%
Nomination System and Centralized Control: 7/21 = 33%
Nomination System and Diffuse Control: 11/21 = 52%
Nomination System and Without Constitutional Control: 3/21 = 14%
Majoritarian, Proportional, and Nomination System and Centralized Control: 2/2 = 100%
Without an Upper House and Centralized Control: 61/112 = 54%
Without an Upper House and Diffuse Control: 31/112 = 27%
Without an Upper House and Mixed Control: 15/112 = 13%
Without an Upper House and Without Constitutional Control: 5/113 = 4%