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 | 13 | 9,46% |
| 2020 | 12 | -16,02% |
| 2019 | 14 | -20,20% |
| 2018 | 18 | -19,71% |
| 2017 | 23 | -26,64% |
| 2016 | 31 | -11,57% |
| 2015 | 35 | -6,42% |
| 2014 | 37 | -10,76% |
| 2013 | 42 | -9,38% |
| 2012 | 46 | 12,51% |
| 2011 | 41 | 30,69% |
| 2010 | 31 |