Statistical summary

Federal and Majoritarian System: 5/24 = 20.8%
Federal and Proportional System: 4/24 = 16.6%
Federal and Mixed System: 2/24 = 8%
Federal and Majoritarian System and Nomination: 3/24 = 13%
Federal and Proportional System and Nomination: 2/24 = 8%
Federal and Nomination System: 3/24 = 13%
Federal and With an Upper House: 21/24 = 88%
Federal and Without an Upper House: 5/24 = 21%