Figures in constant (2020) US$ are present according to calendar year, calculated on the assumption that, where financial years do not correspond to calendar years, spending is distributed evenly through the year
| التاريخ | Value | تغيير , % |
|---|---|---|
| 2021 | 557 | -6.99 % |
| 2020 | 599 | 1.86 % |
| 2019 | 588 | 5.12 % |
| 2018 | 559 | 12.07 % |
| 2017 | 499 | 10.91 % |
| 2016 | 450 | 5.45 % |
| 2015 | 427 | 7.37 % |
| 2014 | 398 | 15.45 % |
| 2013 | 344 | -1.89 % |
| 2012 | 351 | 12.78 % |
| 2011 | 311 | -7.19 % |
| 2010 | 335 |