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 | 488 | -3,09 % |
| 2020 | 504 | -6,12 % |
| 2019 | 537 | -5,20 % |
| 2018 | 566 | 0,86 % |
| 2017 | 562 | 4,32 % |
| 2016 | 538 | 9,79 % |
| 2015 | 490 | 2,51 % |
| 2014 | 478 | 9,08 % |
| 2013 | 438 | 0,25 % |
| 2012 | 437 | -6,38 % |
| 2011 | 467 | -2,73 % |
| 2010 | 480 |