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
| Fecha | Valor | Cambiar , % |
|---|---|---|
| 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 |