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 | 31 | -18,67% |
| 2020 | 39 | -5,84% |
| 2019 | 41 | -8,95% |
| 2018 | 45 | -7,48% |
| 2017 | 49 | 9,40% |
| 2016 | 45 | 2,01% |
| 2015 | 44 | 5,14% |
| 2014 | 41 | 6,12% |
| 2013 | 39 | 0,98% |
| 2012 | 39 | -2,42% |
| 2011 | 40 | -22,27% |
| 2010 | 51 |