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
| التاريخ | Value | تغيير , % |
|---|---|---|
| 2021 | 17 | -35.10 % |
| 2020 | 26 | 98.62 % |
| 2019 | 13 | -9.29 % |
| 2018 | 15 | 73.37 % |
| 2017 | 8 | 7.88 % |
| 2016 | 8 | -2.86 % |
| 2015 | 8 | 45.12 % |
| 2014 | 6 | 4.65 % |
| 2013 | 5 | |
| 2011 | 0 | |
| 2010 | 0 | |
| 2009 | 0 |