the highest = the best
| التاريخ | Value | تغيير , % |
|---|---|---|
| 2021 | 39.65 | -0.59 % |
| 2020 | 39.88 | -1.01 % |
| 2019 | 40.29 | 1.01 % |
| 2018 | 39.89 | 2.36 % |
| 2017 | 38.97 | -0.20 % |
| 2016 | 39.05 | 0.05 % |
| 2015 | 39.03 | -0.13 % |
| 2014 | 39.08 | 0.62 % |
| 2013 | 38.84 | 1.68 % |
| 2012 | 38.20 | -1.28 % |
| 2011 | 38.70 | -1.89 % |
| 2010 | 39.44 |