the highest = the best
| التاريخ | Value | تغيير , % |
|---|---|---|
| 2021 | 82.18 | -0.10 % |
| 2020 | 82.26 | -0.39 % |
| 2019 | 82.58 | 0.19 % |
| 2018 | 82.43 | 0.49 % |
| 2017 | 82.02 | 0.56 % |
| 2016 | 81.57 | 0.18 % |
| 2015 | 81.42 | 0.43 % |
| 2014 | 81.07 | -0.05 % |
| 2013 | 81.11 | 0.40 % |
| 2012 | 80.79 | 0.14 % |
| 2011 | 80.68 | -0.14 % |
| 2010 | 80.78 |