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 | 93 | 12,11 % |
| 2020 | 83 | 10,48 % |
| 2019 | 75 | 3,09 % |
| 2018 | 73 | 6,21 % |
| 2017 | 69 | 2,54 % |
| 2016 | 67 | 9,08 % |
| 2015 | 61 | -0,77 % |
| 2014 | 62 | 5,00 % |
| 2013 | 59 | -9,34 % |
| 2012 | 65 | -11,38 % |
| 2011 | 73 | -2,65 % |
| 2010 | 75 |