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
| Date | Valeur | Modifier , % |
|---|---|---|
| 2021 | 774 | 4,32 % |
| 2020 | 742 | 5,11 % |
| 2019 | 706 | 0,02 % |
| 2018 | 706 | 36,31 % |
| 2017 | 518 | 13,55 % |
| 2016 | 456 | 44,13 % |
| 2015 | 316 | 14,16 % |
| 2014 | 277 | 3,71 % |
| 2013 | 267 | 7,37 % |
| 2012 | 249 | -8,07 % |
| 2011 | 271 | 3,49 % |
| 2010 | 262 |