Statistical summary

Majoritarian System and Presidential System: 23/62 = 37%
Majoritarian System and Parliamentary System: 29/62 = 46%
Majoritarian System and Semi-Presidential System: 8/62 = 13%
Majoritarian System and Monarchical System: 2/62 = 3%
Proportional System and Presidential System: 17/72 = 23%
Proportional System and Parliamentary System: 24/72 = 33%
Proportional System and Semi-Presidential System: 29/72 = 40%
Proportional System and Monarchical System: 2/72 = 3%
Mixed System and Presidential System: 14/43 = 33%
Mixed System and Parliamentary System: 10/43 = 23%
Mixed System and Semi-Presidential System: 17/43 = 40%
Mixed System and Monarchical System: 1/43 = 2%
Mixed System and Directorial System: 1/43 = 2%
Majoritarian and Nomination System and Presidential System: 4/12 = 33%
Majoritarian and Nomination System and Parliamentary System: 5/12 = 42%
Majoritarian and Nomination System and Monarchical System: 3/12 = 25%
Proportional and Nomination System and Presidential System: 1/1 = 100%
Nomination System and Monarchical System: 1/1 = 100%
No Lower House and Monarchical System: 3/3 = 100%