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 | 4 017 | 56,45% |
| 2020 | 2 568 | 29,15% |
| 2019 | 1 988 | -8,26% |
| 2018 | 2 167 | 17,98% |
| 2017 | 1 837 | -4,38% |
| 2016 | 1 921 | -3,42% |
| 2015 | 1 989 | -2,45% |
| 2014 | 2 039 | -9,09% |
| 2013 | 2 243 | -3,86% |
| 2012 | 2 333 | -11,90% |
| 2011 | 2 648 | 11,32% |
| 2010 | 2 379 |