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 | 18.747 | -4,31 % |
| 2020 | 19.591 | -4,27 % |
| 2019 | 20.465 | -4,31 % |
| 2018 | 21.388 | 6,64 % |
| 2017 | 20.057 | 6,52 % |
| 2016 | 18.829 | -5,08 % |
| 2015 | 19.836 | -2,32 % |
| 2014 | 20.307 | 2,00 % |
| 2013 | 19.909 | 0,54 % |
| 2012 | 19.801 | 1,92 % |
| 2011 | 19.428 | -3,14 % |
| 2010 | 20.057 |