Natural Gas Annual Historical |
|---|
| 2007 | Released January 2009 |
| 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 |