单位:千吨
时间范围:1995 - 2023
数据来源:美国地质调查局
| 序号 | 时间(年) | 数据(千吨) |
|---|---|---|
| 1 | 2023 | |
| 2 | 2022 | |
| 3 | 2021 | |
| 4 | 2020 | |
| 5 | 2019 | |
| 6 | 2018 | 350.00 |
| 7 | 2017 | 400.00 |
| 8 | 2016 | 400.00 |
| 9 | 2015 | 380.00 |
| 10 | 2014 | 170.00 |
| 11 | 2013 | 170.00 |
| 12 | 2012 | 380.00 |
| 13 | 2011 | 383.00 |
| 14 | 2010 | 400.00 |
| 15 | 2009 | 392.00 |
| 16 | 2008 | 400.00 |
| 17 | 2007 | 400.00 |
| 18 | 2006 | 398.00 |
| 19 | 2005 | 305.00 |
| 20 | 2004 | 300.00 |
| 21 | 2003 | 300.00 |
| 22 | 2002 | 224.00 |
| 23 | 2001 | 250.00 |
| 24 | 2000 | 400.00 |
| 25 | 1999 | 400.00 |
| 26 | 1998 | 270.00 |
| 27 | 1997 | 360.00 |
| 28 | 1996 | 260.00 |
| 29 | 1995 | 250.00 |
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