单位:%
时间范围:1987 - 2025
数据来源:美国农业部
| 序号 | 时间(年) | 数据(%) |
|---|---|---|
| 1 | 2025 | |
| 2 | 2024 | |
| 3 | 2023 | |
| 4 | 2022 | |
| 5 | 2021 | |
| 6 | 2020 | 25.83 |
| 7 | 2019 | 24.76 |
| 8 | 2018 | 19.38 |
| 9 | 2017 | 20.50 |
| 10 | 2016 | 17.75 |
| 11 | 2015 | 17.28 |
| 12 | 2014 | 18.64 |
| 13 | 2013 | 19.34 |
| 14 | 2012 | 21.95 |
| 15 | 2011 | 18.42 |
| 16 | 2010 | 20.00 |
| 17 | 2009 | 16.00 |
| 18 | 2008 | 19.00 |
| 19 | 2007 | 18.00 |
| 20 | 2006 | 17.00 |
| 21 | 2005 | 16.00 |
| 22 | 2004 | 15.58 |
| 23 | 2003 | 13.13 |
| 24 | 2002 | 13.45 |
| 25 | 2001 | 12.33 |
| 26 | 2000 | 13.88 |
| 27 | 1999 | 11.10 |
| 28 | 1998 | 13.26 |
| 29 | 1997 | 16.00 |
| 30 | 1996 | 14.52 |
| 31 | 1995 | 27.57 |
| 32 | 1994 | 19.03 |
| 33 | 1993 | 4.53 |
| 34 | 1992 | 6.19 |
| 35 | 1991 | 3.61 |
| 36 | 1990 | 14.68 |
| 37 | 1989 | 16.84 |
| 38 | 1988 | 16.70 |
| 39 | 1987 | 12.50 |
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