the highest = the best
| التاريخ | Value | تغيير , % |
|---|---|---|
| 2021 | 33.46 | 0.48 % |
| 2020 | 33.30 | 0.30 % |
| 2019 | 33.20 | 1.51 % |
| 2018 | 32.71 | -2.71 % |
| 2017 | 33.62 | -3.13 % |
| 2016 | 34.71 | -0.17 % |
| 2015 | 34.77 | 2.75 % |
| 2014 | 33.84 | 1.68 % |
| 2013 | 33.28 | 1.48 % |
| 2012 | 32.79 | 4.87 % |
| 2011 | 31.27 | 4.14 % |
| 2010 | 30.03 |