| 年度 | 数值 | 单位 | 发布日期 |
|---|---|---|---|
| 2015 | 3 | 千吨 | 2026-9 |
| 2014 | 5 | 千吨 | 2026-9 |
| 2013 | 1 | 千吨 | 2026-9 |
| 2012 | 0 | 千吨 | 2026-9 |
| 2011 | 1 | 千吨 | 2026-9 |
| 2010 | 1 | 千吨 | 2026-9 |
| 2009 | 0 | 千吨 | 2026-9 |
| 2008 | 0 | 千吨 | 2026-9 |
| 2007 | 0 | 千吨 | 2026-9 |
| 2006 | 0 | 千吨 | 2026-9 |
| 2005 | 0 | 千吨 | 2026-9 |
| 2004 | 0 | 千吨 | 2026-9 |
| 2003 | 0 | 千吨 | 2026-9 |
| 2002 | 1 | 千吨 | 2026-9 |
| 2001 | 2 | 千吨 | 2026-9 |
| 2000 | 10 | 千吨 | 2026-9 |
| 1999 | 12 | 千吨 | 2026-9 |
| 1998 | 18 | 千吨 | 2026-9 |
| 1997 | 22 | 千吨 | 2026-9 |
| 1996 | 35 | 千吨 | 2026-9 |
| 1995 | 43 | 千吨 | 2026-9 |
| 1994 | 36 | 千吨 | 2026-9 |
| 1993 | 55 | 千吨 | 2026-9 |
| 1992 | 52 | 千吨 | 2026-9 |
| 1991 | 127 | 千吨 | 2026-9 |
| 1990 | 141 | 千吨 | 2026-9 |
| 1989 | 157 | 千吨 | 2026-9 |
| 1988 | 142 | 千吨 | 2026-9 |