the highest = the best
| التاريخ | Value | تغيير , % |
|---|---|---|
| 2021 | 71.77 | 1.33 % |
| 2020 | 70.83 | 0.53 % |
| 2019 | 70.45 | -0.44 % |
| 2018 | 70.76 | 2.02 % |
| 2017 | 69.36 | 0.66 % |
| 2016 | 68.91 | 1.29 % |
| 2015 | 68.03 | 0.45 % |
| 2014 | 67.72 | 0.95 % |
| 2013 | 67.08 | 0.74 % |
| 2012 | 66.59 | 0.46 % |
| 2011 | 66.28 | 0.32 % |
| 2010 | 66.07 |