| 序号 | 时间 (年) |
数据 (亿美元) |
|---|---|---|
| 1 | 2021 | |
| 2 | 2020 | |
| 3 | 2019 | |
| 4 | 2018 | |
| 5 | 2017 | |
| 6 | 2016 | |
| 7 | 2015 | 24.92 |
| 8 | 2014 | 22.76 |
| 9 | 2013 | 19.93 |
| 10 | 2012 | 18.87 |
| 11 | 2011 | 18.92 |
| 12 | 2010 | 17.99 |
| 13 | 2009 | 15.73 |
| 14 | 2008 | 11.41 |
| 15 | 2007 | 11.03 |
| 16 | 2006 | 9.22 |
| 17 | 2005 | 7.28 |
| 18 | 2004 | 6.68 |
| 19 | 2003 | 5.08 |
| 20 | 2002 | 4.53 |
| 21 | 2001 | 3.84 |
| 22 | 2000 | 4.92 |
| 23 | 1999 | 5.14 |
| 24 | 1998 | 3.55 |
| 25 | 1997 | 3.82 |
| 26 | 1996 | 2.03 |
| 27 | 1995 | 1.42 |
| 28 | 1994 | 1.46 |
| 29 | 1993 | 0.59 |
| 30 | 1992 | 2.89 |
| 31 | 1991 | 1.69 |
| 32 | 1990 | 1.66 |
| 33 | 1989 | 1.64 |
| 34 | 1988 | 1.66 |
| 35 | 1987 | 1.13 |
| 36 | 1982 | 1.71 |
| 37 | 1981 | 1.11 |
| 38 | 1980 | 0.75 |
| 39 | 1979 | 1.56 |
| 40 | 1978 | 0.57 |
| 41 | 1977 | 1.53 |
| 42 | 1976 | 1.48 |
| 43 | 1975 | 1.24 |
| 44 | 1974 | 1.08 |
| 45 | 1973 | 1.18 |
| 46 | 1972 | 0.81 |
| 47 | 1971 | 0.59 |
| 48 | 1970 | 0.49 |
| 49 | 1969 | 0.44 |
| 50 | 1968 | 0.49 |
| 51 | 1967 | 0.32 |
| 52 | 1966 | 0.58 |
| 53 | 1965 | 0.57 |
| 54 | 1964 | 0.39 |
| 55 | 1963 | 0.32 |
| 56 | 1962 | 0.17 |
| 57 | 1961 | 0.14 |
| 58 | 1960 | 0.12 |
