the highest = the best
| التاريخ | Value | تغيير , % |
|---|---|---|
| 2021 | 52.19 | 0.02 % |
| 2020 | 52.18 | 0.31 % |
| 2019 | 52.02 | 0.83 % |
| 2018 | 51.60 | 2.48 % |
| 2017 | 50.35 | -0.44 % |
| 2016 | 50.57 | 0.33 % |
| 2015 | 50.40 | 0.42 % |
| 2014 | 50.19 | 2.76 % |
| 2013 | 48.84 | -0.16 % |
| 2012 | 48.92 | -2.68 % |
| 2011 | 50.27 | 1.80 % |
| 2010 | 49.38 |