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 | 11 | -5,96 % |
| 2020 | 11 | 13,21 % |
| 2019 | 10 | -5,33 % |
| 2018 | 11 | 7,57 % |
| 2017 | 10 | -10,11 % |
| 2016 | 11 | 15,97 % |
| 2015 | 9 | 6,07 % |
| 2014 | 9 | 2,70 % |
| 2013 | 9 | -3,89 % |
| 2012 | 9 | 5,28 % |
| 2011 | 9 | 8,00 % |
| 2010 | 8 |