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
| Дата | Значение | Изменение , % |
|---|---|---|
| 1992 | 7 006 | 1,44% |
| 1991 | 6 907 | -34,41% |
| 1990 | 10 530 | -12,76% |
| 1989 | 12 071 | 47,69% |
| 1988 | 8 173 | 2,39% |
| 1987 | 7 982 | 0,59% |
| 1986 | 7 935 | -0,83% |
| 1985 | 8 001 | 5,62% |
| 1984 | 7 575 | 2,99% |
| 1983 | 7 355 | 1,83% |
| 1982 | 7 223 | 1,27% |
| 1981 | 7 133 |