Statistical summary

Majoritarian System and Unitary: 13/18 = 72%
Majoritarian System and Federal: 5/18 = 27%
Proportional System and Unitary: 7/11 = 63%
Proportional System and Federal: 4/11 = 36%
Mixed System and Unitary: 4/6 = 67%
Mixed System and Federal: 2/6 = 33%
Majoritarian and Nomination System and Unitary: 14/17 = 82%
Majoritarian and Nomination System and Federal: 3/17 = 17%
Proportional and Nomination System and Unitary: 5/7 = 71%
Proportional and Nomination System and Federal: 2/7 = 28.5%
Nomination System and Unitary: 18/21 = 86%
Nomination System and Federal: 3/21 = 14%
Majoritarian, Proportional, and Nomination System and Unitary: 2/2 = 100%
Majoritarian, Proportional, and Nomination System and Federal: 0/2 = 0%
Without an Upper House and Unitary: 107/112 = 95.5%
Without an Upper House and Federal: 5/112 = 4.5%