Statistical summary

Parliamentary and Majoritarian: 2/68 = 3%
Parliamentary and Proportional: 3/68 = 4%
Parliamentary and Mixed: 2/68 = 3%
Parliamentary and Majoritarian and Nomination System: 4/68 = 6%
Parliamentary and Proportional and Nomination System: 3/68 = 4%
Parliamentary and Nomination System: 14/68 = 21%
Parliamentary and Without an Upper House: 40/68 = 59%