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 | 52.488 | -1,36 % |
| 2020 | 53.211 | 6,11 % |
| 2019 | 50.149 | 9,71 % |
| 2018 | 45.710 | 2,77 % |
| 2017 | 44.480 | 2,84 % |
| 2016 | 43.253 | 4,20 % |
| 2015 | 41.511 | 1,72 % |
| 2014 | 40.810 | 0,12 % |
| 2013 | 40.762 | -3,70 % |
| 2012 | 42.326 | 2,86 % |
| 2011 | 41.151 | -2,03 % |
| 2010 | 42.002 |