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 | 2,803 | -13.24 % |
| 2020 | 3,231 | 3.84 % |
| 2019 | 3,111 | -0.66 % |
| 2018 | 3,132 | -4.17 % |
| 2017 | 3,268 | -1.43 % |
| 2016 | 3,316 | -2.60 % |
| 2015 | 3,404 | 0.83 % |
| 2014 | 3,376 | 0.10 % |
| 2013 | 3,373 | 1.98 % |
| 2012 | 3,307 | 4.51 % |
| 2011 | 3,164 | 3.60 % |
| 2010 | 3,055 |