the highest = the best
| التاريخ | Value | تغيير , % |
|---|---|---|
| 2021 | 58.97 | 1.57 % |
| 2020 | 58.06 | 0.67 % |
| 2019 | 57.67 | 1.72 % |
| 2018 | 56.70 | 1.09 % |
| 2017 | 56.09 | -0.50 % |
| 2016 | 56.37 | -0.29 % |
| 2015 | 56.53 | 1.33 % |
| 2014 | 55.79 | 1.08 % |
| 2013 | 55.19 | 0.40 % |
| 2012 | 54.97 | 2.24 % |
| 2011 | 53.77 | 2.68 % |
| 2010 | 52.36 |