the highest = the best
| التاريخ | Value | تغيير , % |
|---|---|---|
| 2021 | 53.92 | -1.40 % |
| 2020 | 54.68 | 1.98 % |
| 2019 | 53.62 | 0.75 % |
| 2018 | 53.22 | 1.65 % |
| 2017 | 52.35 | 0.43 % |
| 2016 | 52.12 | 1.11 % |
| 2015 | 51.55 | 0.99 % |
| 2014 | 51.05 | 1.59 % |
| 2013 | 50.25 | -0.37 % |
| 2012 | 50.43 | 1.75 % |
| 2011 | 49.56 | 0.76 % |
| 2010 | 49.19 |