| Fig5-20 | |||
| År | Norge | Europa | USA |
| 2011 | 3,90 | 3,69 | |
| 2012 | 3,99 | 3,71 | 2,90 |
| 2013 | 3,99 | 3,74 | 2,90 |
| 2014 | 4,13 | 3,75 | 2,90 |
| 2015 | 4,10 | 3,73 | 2,91 |
| 2016 | 4,22 | 3,74 | 2,93 |
| 2017 | 4,19 | 3,76 | 2,94 |
| 2018 | 4,14 | 3,78 | 2,97 |
| 2019 | 4,14 | 3,81 | 2,94 |
| 2020 | 4,17 | 3,88 | 3,04 |
| 2021 | 4,16 | 3,88 | 3,13 |
| 2022 | 4,12 | 3,84 | 3,15 |
| 2023 | 4,11 | 3,90 | 3,16 |
| 2024 | 3,19 |