| Region |
Lower chamber and unicameral |
Upper chamber |
All chambers |
| Americas |
35.2% |
36.6% |
35.5% |
| Caribbean |
42.5% |
32.5% |
41.0% |
| North America |
37.6% |
44.3% |
39.0% |
| South America |
31.3% |
31.9% |
31.4% |
| Central America |
30.6% |
42.9% |
30.9% |
| Europe |
31.8% |
31.5% |
31.7% |
| Nordic countries |
45.9% |
45.9% |
|
| Western Europe |
37.1% |
33.8% |
36.0% |
| Southern Europe |
28.8% |
39.6% |
30.8% |
| Central and Eastern Europe |
26.3% |
19.5% |
25.5% |
| Sub-Saharan Africa |
27.2% |
26.9% |
27.2% |
| East Africa |
32.2% |
30.0% |
32.0% |
| Southern Africa |
31.3% |
35.5% |
31.8% |
| Central Africa |
23.5% |
27.0% |
24.3% |
| West Africa |
19.2% |
13.1% |
18.6% |
| Asia |
21.4% |
22.5% |
21.5% |
| Central Asia |
26.2% |
24.6% |
25.8% |
| East Asia |
23.1% |
26.6% |
23.3% |
| South East Asia |
23.0% |
21.3% |
22.8% |
| South Asia |
14.8% |
20.0% |
15.6% |
| Pacific |
19.4% |
49.4% |
22.5% |
| Australia and New Zealand |
41.4% |
56.6% |
44.7% |
| Pacific Islands |
7.1% |
7.7% |
7.2% |
| Middle East and North Africa |
17.9% |
11.7% |
16.6% |
| Middle East |
18.4% |
13.8% |
17.4% |
| North Africa |
17.0% |
8.4% |
15.1% |