the highest = the best
| التاريخ | Value | تغيير , % |
|---|---|---|
| 2021 | 56.60 | -1.33 % |
| 2020 | 57.36 | 3.14 % |
| 2019 | 55.61 | 2.88 % |
| 2018 | 54.05 | 1.89 % |
| 2017 | 53.05 | 0.34 % |
| 2016 | 52.87 | -0.74 % |
| 2015 | 53.27 | 1.09 % |
| 2014 | 52.69 | 1.10 % |
| 2013 | 52.12 | 1.60 % |
| 2012 | 51.30 | -0.45 % |
| 2011 | 51.53 | -0.87 % |
| 2010 | 51.98 |