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 | 2.589 | 15,71 % |
| 2020 | 2.238 | 17,44 % |
| 2019 | 1.905 | 8,07 % |
| 2018 | 1.763 | 5,21 % |
| 2017 | 1.676 | -27,01 % |
| 2016 | 2.296 | -33,30 % |
| 2015 | 3.442 | 6,27 % |
| 2014 | 3.239 | 0,37 % |
| 2013 | 3.227 | 1,15 % |
| 2012 | 3.191 | 3,75 % |
| 2011 | 3.075 | 90,27 % |
| 2010 | 1.616 |