| 序号 | 时间 (年) |
数据 (美元) |
|---|---|---|
| 1 | 2019 | |
| 2 | 2018 | |
| 3 | 2017 | |
| 4 | 2016 | |
| 5 | 2015 | |
| 6 | 2014 | |
| 7 | 2001 | |
| 8 | 2000 | |
| 9 | 1999 | |
| 10 | 1990 | |
| 11 | 1989 | 181406.22 |
| 12 | 1988 | 486038.91 |
| 13 | 1987 | 437265.53 |
| 14 | 1985 | 1704141.43 |
| 15 | 1984 | 733157.63 |
| 16 | 1983 | 1743221.19 |
| 17 | 1982 | 456000.12 |
| 18 | 1981 | 1279589.73 |
| 19 | 1980 | 657827.85 |
| 20 | 1979 | 532747.87 |
| 21 | 1977 | 839589.85 |
| 22 | 1976 | 3588072.90 |
