the highest = the best
| التاريخ | Value | تغيير , % |
|---|---|---|
| 2021 | 58.70 | 0.23 % |
| 2020 | 58.57 | 1.89 % |
| 2019 | 57.48 | 0.79 % |
| 2018 | 57.03 | -0.06 % |
| 2017 | 57.06 | 0.85 % |
| 2016 | 56.58 | 0.32 % |
| 2015 | 56.40 | 0.31 % |
| 2014 | 56.23 | 0.25 % |
| 2013 | 56.09 | 0.32 % |
| 2012 | 55.91 | 1.71 % |
| 2011 | 54.97 | -0.86 % |
| 2010 | 55.44 |