Units : $/lb
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| Year |
Value |
| 1975 |
1.0860 |
| 1976 |
1.1568 |
| 1977 |
1.1450 |
| 1978 |
1.2564 |
| 1979 |
1.4176 |
| 1980 |
1.5659 |
| 1981 |
1.6725 |
| 1982 |
1.6626 |
| 1983 |
1.6652 |
| 1984 |
1.6761 |
| 1985 |
1.6326 |
| 1986 |
1.5798 |
| 1987 |
1.5518 |
| 1988 |
1.5741 |
| 1989 |
1.7258 |
| 1990 |
1.7655 |
| 1991 |
1.7104 |
| 1992 |
1.6461 |
| 1993 |
1.6225 |
| 1994 |
1.6058 |
| 1995 |
1.6011 |
| 1996 |
1.7140 |
| 1997 |
1.6117 |
| 1998 |
1.7893 |
| 1999 |
1.6078 |
| 2000 |
1.3411 |
| 2001 |
1.6338 |
| 2002 |
1.3766 |
| 2003 |
1.5640 |
| 2004 |
1.9499 |
| 2005 |
1.7927 |
| 2006 |
1.5309 |
| 2007 |
2.0324 |
| 2008 |
2.1543 |
| 2009 |
1.5886 |
| 2010 |
1.8055 |
| 2011 |
2.1045 |
| 2012 |
1.9959 |
| 2013 |
1.9855 |
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Note: Values shown are averages up to current month or full 12-month total.