The highest = the best
| التاريخ | Value | تغيير , % |
|---|---|---|
| 2023 | 3.60 | 4.05 % |
| 2022 | 3.46 | -13.50 % |
| 2021 | 4.00 | -3.22 % |
| 2020 | 4.13 | -4.70 % |
| 2019 | 4.34 | 1.66 % |
| 2018 | 4.27 | 6.92 % |
| 2017 | 3.99 | 0.23 % |
| 2016 | 3.98 | -1.78 % |
| 2015 | 4.05 | -11.89 % |
| 2014 | 4.60 | 4.55 % |
| 2013 | 4.40 | 0.00 % |
| 2012 | 4.40 |