the highest = the best
| التاريخ | Value | تغيير , % |
|---|---|---|
| 2021 | 62.28 | 0.41 % |
| 2020 | 62.03 | 0.10 % |
| 2019 | 61.97 | 1.56 % |
| 2018 | 61.02 | 1.65 % |
| 2017 | 60.03 | 0.28 % |
| 2016 | 59.86 | -0.17 % |
| 2015 | 59.96 | 0.23 % |
| 2014 | 59.83 | 1.82 % |
| 2013 | 58.76 | 0.97 % |
| 2012 | 58.20 | -0.01 % |
| 2011 | 58.20 | 1.99 % |
| 2010 | 57.07 |