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 | 613 | 20,12 % |
| 2020 | 510 | -14,89 % |
| 2019 | 600 | -3,36 % |
| 2018 | 621 | 2,32 % |
| 2017 | 607 | 7,90 % |
| 2016 | 562 | -13,66 % |
| 2015 | 651 | -10,86 % |
| 2014 | 730 | 4,83 % |
| 2013 | 697 | 6,80 % |
| 2012 | 652 | 18,05 % |
| 2011 | 553 | 8,19 % |
| 2010 | 511 |