the highest = the best
| التاريخ | Value | تغيير , % |
|---|---|---|
| 2021 | 59.31 | 1.11 % |
| 2020 | 58.66 | 0.98 % |
| 2019 | 58.09 | 1.01 % |
| 2018 | 57.51 | 0.80 % |
| 2017 | 57.06 | 0.82 % |
| 2016 | 56.59 | -0.98 % |
| 2015 | 57.15 | 2.04 % |
| 2014 | 56.01 | 1.47 % |
| 2013 | 55.20 | -0.33 % |
| 2012 | 55.38 | -0.20 % |
| 2011 | 55.49 | 1.22 % |
| 2010 | 54.82 |