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
| Дата | Значение | Изменение , % |
|---|---|---|
| 2021 | 5 113 | 2,66% |
| 2020 | 4 980 | 6,73% |
| 2019 | 4 666 | 4,77% |
| 2018 | 4 454 | 14,40% |
| 2017 | 3 893 | 2,02% |
| 2016 | 3 816 | 6,61% |
| 2015 | 3 580 | -1,04% |
| 2014 | 3 617 | -4,39% |
| 2013 | 3 784 | -8,28% |
| 2012 | 4 125 | 3,13% |
| 2011 | 4 000 | -6,79% |
| 2010 | 4 291 |