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 | 418 | -3.96 % |
| 2020 | 435 | 2.98 % |
| 2019 | 423 | -3.17 % |
| 2018 | 437 | -1.88 % |
| 2017 | 445 | 15.06 % |
| 2016 | 387 | 6.24 % |
| 2015 | 364 | -3.97 % |
| 2014 | 379 | 13.02 % |
| 2013 | 335 | 9.60 % |
| 2012 | 306 | -5.13 % |
| 2011 | 323 | 3.38 % |
| 2010 | 312 |