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 | 69 | -10,47% |
| 2020 | 77 | 13,04% |
| 2019 | 68 | 6,98% |
| 2018 | 63 | 3,13% |
| 2017 | 61 | 12,88% |
| 2016 | 54 | 10,50% |
| 2015 | 49 | 19,43% |
| 2014 | 41 | 11,33% |
| 2013 | 37 | 3,40% |
| 2012 | 36 | 1,22% |
| 2011 | 35 | -0,44% |
| 2010 | 36 |