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
| 日付 | 値 | 変更 , % |
|---|---|---|
| 2021 | 25 | 13.18% |
| 2020 | 22 | -22.37% |
| 2019 | 29 | -8.82% |
| 2018 | 32 | -30.60% |
| 2017 | 46 | -9.21% |
| 2016 | 50 | 22.70% |
| 2015 | 41 | -15.41% |
| 2014 | 48 | 53.72% |
| 2013 | 31 | 0.64% |
| 2012 | 31 | 9.46% |
| 2011 | 29 | 4.07% |
| 2010 | 27 |