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
| Datum | Wert | Ändern , % |
|---|---|---|
| 2021 | 346 | -5,99 % |
| 2020 | 368 | -0,71 % |
| 2019 | 371 | -4,53 % |
| 2018 | 388 | -4,26 % |
| 2017 | 406 | -9,09 % |
| 2016 | 446 | -11,25 % |
| 2015 | 503 | 9,63 % |
| 2014 | 459 | 47,05 % |
| 2013 | 312 | 5,36 % |
| 2012 | 296 | -1,56 % |
| 2011 | 301 | 5,66 % |
| 2010 | 285 |