the highest = the best
| التاريخ | Value | تغيير , % |
|---|---|---|
| 2021 | 57.24 | -0.10 % |
| 2020 | 57.30 | 0.99 % |
| 2019 | 56.73 | -0.70 % |
| 2018 | 57.13 | -0.37 % |
| 2017 | 57.34 | 1.44 % |
| 2016 | 56.53 | 0.17 % |
| 2015 | 56.43 | -0.95 % |
| 2014 | 56.97 | 2.15 % |
| 2013 | 55.78 | -0.69 % |
| 2012 | 56.16 | -0.87 % |
| 2011 | 56.65 | 0.59 % |
| 2010 | 56.32 |