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 | 39 | 0,39% |
| 2020 | 38 | 10,79% |
| 2019 | 35 | 65,43% |
| 2018 | 21 | -21,07% |
| 2017 | 27 | -3,49% |
| 2016 | 28 | -28,10% |
| 2015 | 38 | 24,07% |
| 2014 | 31 | -7,17% |
| 2013 | 33 | -14,58% |
| 2012 | 39 | 45,46% |
| 2011 | 27 | -31,46% |
| 2010 | 39 |