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 | 73,575 | 0.87 % |
| 2020 | 72,937 | -3.07 % |
| 2019 | 75,249 | 6.13 % |
| 2018 | 70,902 | 4.36 % |
| 2017 | 67,939 | 7.04 % |
| 2016 | 63,468 | 10.21 % |
| 2015 | 57,590 | 0.03 % |
| 2014 | 57,573 | 5.18 % |
| 2013 | 54,737 | -0.74 % |
| 2012 | 55,144 | -0.36 % |
| 2011 | 55,340 | 0.97 % |
| 2010 | 54,810 |