the highest = the best
| التاريخ | Value | تغيير , % |
|---|---|---|
| 2021 | 58.04 | -0.35 % |
| 2020 | 58.24 | 0.50 % |
| 2019 | 57.95 | 0.37 % |
| 2018 | 57.74 | -0.07 % |
| 2017 | 57.78 | 0.50 % |
| 2016 | 57.49 | 0.35 % |
| 2015 | 57.29 | -0.14 % |
| 2014 | 57.37 | 0.93 % |
| 2013 | 56.84 | 0.36 % |
| 2012 | 56.64 | 1.30 % |
| 2011 | 55.91 | 1.25 % |
| 2010 | 55.22 |