| Rank | Country | Value | Year |
|---|---|---|---|
| 1 | Singapore | 4.3 | 2022 |
| 2 | Finland | 4.2 | 2022 |
| 3 | Denmark | 4.1 | 2022 |
| 4 | Germany | 4.1 | 2022 |
| 5 | Netherlands | 4.1 | 2022 |
| 6 | Switzerland | 4.1 | 2022 |
| 7 | Austria | 4 | 2022 |
| 8 | Belgium | 4 | 2022 |
| 9 | Canada | 4 | 2022 |
| 10 | Hong Kong SAR, China | 4 | 2022 |
| 11 | Sweden | 4 | 2022 |
| 12 | United Arab Emirates | 4 | 2022 |
| 13 | France | 3.9 | 2022 |
| 14 | Japan | 3.9 | 2022 |
| 15 | Spain | 3.9 | 2022 |
| 16 | Korea, Rep. | 3.8 | 2022 |
| 17 | United States | 3.8 | 2022 |
| 18 | Australia | 3.7 | 2022 |
| 19 | China | 3.7 | 2022 |
| 20 | Greece | 3.7 | 2022 |
| 21 | Italy | 3.7 | 2022 |
| 22 | Norway | 3.7 | 2022 |
| 23 | South Africa | 3.7 | 2022 |
| 24 | United Kingdom | 3.7 | 2022 |
| 25 | Estonia | 3.6 | 2022 |
| 26 | Iceland | 3.6 | 2022 |
| 27 | Ireland | 3.6 | 2022 |
| 28 | Israel | 3.6 | 2022 |
| 29 | Luxembourg | 3.6 | 2022 |
| 30 | Malaysia | 3.6 | 2022 |
| 31 | New Zealand | 3.6 | 2022 |
| 32 | Poland | 3.6 | 2022 |
| 33 | Bahrain | 3.5 | 2022 |
| 34 | Latvia | 3.5 | 2022 |
| 35 | Qatar | 3.5 | 2022 |
| 36 | Thailand | 3.5 | 2022 |
| 37 | India | 3.4 | 2022 |
| 38 | Lithuania | 3.4 | 2022 |
| 39 | Portugal | 3.4 | 2022 |
| 40 | Saudi Arabia | 3.4 | 2022 |
| 41 | Turkiye | 3.4 | 2022 |
| 42 | Croatia | 3.3 | 2022 |
| 43 | Czechia | 3.3 | 2022 |
| 44 | Malta | 3.3 | 2022 |
| 45 | Oman | 3.3 | 2022 |
| 46 | Philippines | 3.3 | 2022 |
| 47 | Slovak Republic | 3.3 | 2022 |
| 48 | Slovenia | 3.3 | 2022 |
| 49 | Viet Nam | 3.3 | 2022 |
| 50 | Brazil | 3.2 | 2022 |
| 51 | Bulgaria | 3.2 | 2022 |
| 52 | Cyprus | 3.2 | 2022 |
| 53 | Hungary | 3.2 | 2022 |
| 54 | Kuwait | 3.2 | 2022 |
| 55 | Romania | 3.2 | 2022 |
| 56 | Botswana | 3.1 | 2022 |
| 57 | Egypt, Arab Rep. | 3.1 | 2022 |
| 58 | North Macedonia | 3.1 | 2022 |
| 59 | Panama | 3.1 | 2022 |
| 60 | Bosnia and Herzegovina | 3 | 2022 |
| 61 | Chile | 3 | 2022 |
| 62 | Indonesia | 3 | 2022 |
| 63 | Peru | 3 | 2022 |
| 64 | Uruguay | 3 | 2022 |
| 65 | Antigua and Barbuda | 2.9 | 2022 |
| 66 | Benin | 2.9 | 2022 |
| 67 | Colombia | 2.9 | 2022 |
| 68 | Costa Rica | 2.9 | 2022 |
| 69 | Honduras | 2.9 | 2022 |
| 70 | Mexico | 2.9 | 2022 |
| 71 | Namibia | 2.9 | 2022 |
| 72 | Argentina | 2.8 | 2022 |
| 73 | Montenegro | 2.8 | 2022 |
| 74 | Rwanda | 2.8 | 2022 |
| 75 | Serbia | 2.8 | 2022 |
| 76 | Solomon Islands | 2.8 | 2022 |
| 77 | Sri Lanka | 2.8 | 2022 |
| 78 | Bahamas, The | 2.7 | 2022 |
| 79 | Belarus | 2.7 | 2022 |
| 80 | Djibouti | 2.7 | 2022 |
| 81 | El Salvador | 2.7 | 2022 |
| 82 | Georgia | 2.7 | 2022 |
| 83 | Kazakhstan | 2.7 | 2022 |
| 84 | Papua New Guinea | 2.7 | 2022 |
| 85 | Paraguay | 2.7 | 2022 |
| 86 | Ukraine | 2.7 | 2022 |
| 87 | Bangladesh | 2.6 | 2022 |
| 88 | Congo, Rep. | 2.6 | 2022 |
| 89 | Dominican Republic | 2.6 | 2022 |
| 90 | Guatemala | 2.6 | 2022 |
| 91 | Guinea-Bissau | 2.6 | 2022 |
| 92 | Mali | 2.6 | 2022 |
| 93 | Nigeria | 2.6 | 2022 |
| 94 | Russian Federation | 2.6 | 2022 |
| 95 | Uzbekistan | 2.6 | 2022 |
| 96 | Albania | 2.5 | 2022 |
| 97 | Algeria | 2.5 | 2022 |
| 98 | Armenia | 2.5 | 2022 |
| 99 | Bhutan | 2.5 | 2022 |
| 100 | Central African Republic | 2.5 | 2022 |
| 101 | Congo, Dem. Rep. | 2.5 | 2022 |
| 102 | Ghana | 2.5 | 2022 |
| 103 | Grenada | 2.5 | 2022 |
| 104 | Guinea | 2.5 | 2022 |
| 105 | Jamaica | 2.5 | 2022 |
| 106 | Mauritius | 2.5 | 2022 |
| 107 | Moldova | 2.5 | 2022 |
| 108 | Mongolia | 2.5 | 2022 |
| 109 | Nicaragua | 2.5 | 2022 |
| 110 | Tajikistan | 2.5 | 2022 |
| 111 | Togo | 2.5 | 2022 |
| 112 | Trinidad and Tobago | 2.5 | 2022 |
| 113 | Zimbabwe | 2.5 | 2022 |
| 114 | Bolivia | 2.4 | 2022 |
| 115 | Cambodia | 2.4 | 2022 |
| 116 | Gabon | 2.4 | 2022 |
| 117 | Guyana | 2.4 | 2022 |
| 118 | Iraq | 2.4 | 2022 |
| 119 | Lao PDR | 2.4 | 2022 |
| 120 | Liberia | 2.4 | 2022 |
| 121 | Sudan | 2.4 | 2022 |
| 122 | Burkina Faso | 2.3 | 2022 |
| 123 | Fiji | 2.3 | 2022 |
| 124 | Gambia, The | 2.3 | 2022 |
| 125 | Iran, Islamic Rep. | 2.3 | 2022 |
| 126 | Kyrgyz Republic | 2.3 | 2022 |
| 127 | Madagascar | 2.3 | 2022 |
| 128 | Mauritania | 2.3 | 2022 |
| 129 | Syrian Arab Republic | 2.3 | 2022 |
| 130 | Venezuela, RB | 2.3 | 2022 |
| 131 | Cuba | 2.2 | 2022 |
| 132 | Yemen, Rep. | 2.2 | 2022 |
| 133 | Angola | 2.1 | 2022 |
| 134 | Cameroon | 2.1 | 2022 |
| 135 | Haiti | 2.1 | 2022 |
| 136 | Somalia | 2 | 2022 |
| 137 | Afghanistan | 1.9 | 2022 |
| 138 | Libya | 1.9 | 2022 |