Statistical summary

Diffuse Control and Majoritarian System: 4/25 = 16%
Diffuse Control and Proportional System: 2/25 = 8%
Diffuse Control and Mixed System: 2/25 = 8%
Diffuse Control and Majoritarian and Nomination System: 4/25 = 16%
Diffuse Control and Proportional and Nomination System: 2/25 = 8%
Diffuse Control and Nomination System: 11/25 = 44%
Diffuse Control and Without an Upper House: 31/56 = 55%