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 | 1 600 | 4,63% |
| 2020 | 1 529 | -4,19% |
| 2019 | 1 596 | 1,12% |
| 2018 | 1 579 | -8,33% |
| 2017 | 1 722 | 4,13% |
| 2016 | 1 654 | -12,74% |
| 2015 | 1 895 | 7,78% |
| 2014 | 1 758 | 17,26% |
| 2013 | 1 500 | 2,69% |
| 2012 | 1 460 | -9,65% |
| 2011 | 1 616 | 4,79% |
| 2010 | 1 542 |