the highest = the best
| التاريخ | Value | تغيير , % |
|---|---|---|
| 2021 | 81.10 | -0.30 % |
| 2020 | 81.35 | 0.36 % |
| 2019 | 81.06 | -0.05 % |
| 2018 | 81.09 | 0.17 % |
| 2017 | 80.96 | 0.18 % |
| 2016 | 80.81 | 0.51 % |
| 2015 | 80.41 | 2.68 % |
| 2014 | 78.31 | -1.44 % |
| 2013 | 79.45 | -0.75 % |
| 2012 | 80.05 | 0.06 % |
| 2011 | 80.01 | 0.20 % |
| 2010 | 79.85 |