| 序号 | 时间 (年) |
数据 (亿美元) |
|---|---|---|
| 1 | 2021 | |
| 2 | 2020 | |
| 3 | 2019 | |
| 4 | 2018 | |
| 5 | 2017 | |
| 6 | 2016 | |
| 7 | 2015 | 25.81 |
| 8 | 2014 | 32.21 |
| 9 | 2013 | 33.53 |
| 10 | 2012 | 29.62 |
| 11 | 2011 | 25.92 |
| 12 | 2010 | 22.65 |
| 13 | 2009 | 21.81 |
| 14 | 2008 | 16.61 |
| 15 | 2007 | 15.24 |
| 16 | 2006 | 12.16 |
| 17 | 2005 | 11.03 |
| 18 | 2004 | 11.59 |
| 19 | 2003 | 9.48 |
| 20 | 2002 | 8.25 |
| 21 | 2001 | 7.27 |
| 22 | 2000 | 7.42 |
| 23 | 1999 | 6.71 |
| 24 | 1998 | 6.28 |
| 25 | 1997 | 5.37 |
| 26 | 1996 | 3.44 |
| 27 | 1995 | 1.95 |
| 28 | 1994 | 1.78 |
| 29 | 1993 | 1.87 |
| 30 | 1992 | 2.33 |
| 31 | 1991 | 2.41 |
| 32 | 1990 | 2.32 |
| 33 | 1989 | 2.04 |
| 34 | 1988 | 1.74 |
| 35 | 1987 | 1.18 |
| 36 | 1986 | 0.57 |
| 37 | 1985 | 0.46 |
| 38 | 1984 | 0.55 |
