the highest = the best
| التاريخ | Value | تغيير , % |
|---|---|---|
| 2021 | 56.51 | -0.27 % |
| 2020 | 56.66 | -1.01 % |
| 2019 | 57.24 | 0.24 % |
| 2018 | 57.10 | -1.30 % |
| 2017 | 57.85 | 1.47 % |
| 2016 | 57.01 | 1.96 % |
| 2015 | 55.92 | 2.15 % |
| 2014 | 54.74 | 0.96 % |
| 2013 | 54.22 | 1.28 % |
| 2012 | 53.54 | 2.23 % |
| 2011 | 52.37 | 1.08 % |
| 2010 | 51.81 |