Natural Gas Annual Historical |
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2006 | Released October 2007 |
2005 | Released November 2006 |
2004 | Released December 2005 |
2003 | Released December 2004 |
2002 | Released January 2004 |
2001 | Released February 2003 |
2000 | Released November 2001 |
1999 | Released September 2000 |
1998 | Released October 1999 |
1997 | Released October 1998 |
1996 | Released September 1997 |