单位:%
时间范围:1991 - 2021
数据来源:DOE
序号 | 时间(年) | 数据(%) |
---|---|---|
1 | 2021 | |
2 | 2020 | |
3 | 2019 | |
4 | 2018 | |
5 | 2017 | |
6 | 2016 | 2.45 |
7 | 2015 | 2.51 |
8 | 2014 | 2.54 |
9 | 2013 | 2.65 |
10 | 2012 | 2.74 |
11 | 2011 | 2.81 |
12 | 2010 | 2.95 |
13 | 2009 | 2.99 |
14 | 2008 | 3.15 |
15 | 2007 | 3.21 |
16 | 2006 | 3.34 |
17 | 2005 | 3.45 |
18 | 2004 | 3.62 |
19 | 2003 | 3.74 |
20 | 2002 | 3.81 |
21 | 2001 | 3.85 |
22 | 2000 | 3.84 |
23 | 1999 | 3.91 |
24 | 1998 | 4.00 |
25 | 1997 | 4.06 |
26 | 1996 | 4.13 |
27 | 1995 | 4.19 |
28 | 1994 | 4.27 |
29 | 1993 | 4.39 |
30 | 1992 | 4.55 |
31 | 1991 | 4.63 |
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