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 | 890 | -4,75% |
| 2020 | 934 | -38,94% |
| 2019 | 1 530 | -9,55% |
| 2018 | 1 692 | -49,05% |
| 2017 | 3 320 | 29,81% |
| 2016 | 2 558 | 4,80% |
| 2015 | 2 441 | -52,63% |
| 2009 | 5 153 | -2,48% |
| 2008 | 5 283 | 20,63% |
| 2007 | 4 380 | 26,64% |
| 2006 | 3 458 | 17,62% |
| 2005 | 2 940 |