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
| Datum | Wert | Ändern , % |
|---|---|---|
| 2021 | 55.774 | 7,32 % |
| 2020 | 51.971 | -0,14 % |
| 2019 | 52.042 | 3,23 % |
| 2018 | 50.411 | 5,04 % |
| 2017 | 47.991 | -0,64 % |
| 2016 | 48.302 | -0,60 % |
| 2015 | 48.596 | 1,76 % |
| 2014 | 47.754 | 1,07 % |
| 2013 | 47.250 | -0,42 % |
| 2012 | 47.451 | -1,20 % |
| 2011 | 48.030 | 1,35 % |
| 2010 | 47.392 |