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 | 31 | -18.67% |
| 2020 | 39 | -5.84% |
| 2019 | 41 | -8.95% |
| 2018 | 45 | -7.48% |
| 2017 | 49 | 9.40% |
| 2016 | 45 | 2.01% |
| 2015 | 44 | 5.14% |
| 2014 | 41 | 6.12% |
| 2013 | 39 | 0.98% |
| 2012 | 39 | -2.42% |
| 2011 | 40 | -22.27% |
| 2010 | 51 |