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Loading...
| year | production | consumption |
| 1992 | .03 | .23 |
| 1993 | .03 | .17 |
| 1994 | .03 | .16 |
| 1995 | .03 | .17 |
| 1996 | .02 | .17 |
| 1997 | .03 | .16 |
| 1998 | .03 | .16 |
| 1999 | .03 | .15 |
| 2000 | .03 | .15 |
| 2001 | .03 | .16 |
| 2002 | .03 | .15 |
| 2003 | .02 | .16 |
| 2004 | .03 | .18 |
| 2005 | .03 | .19 |
| 2006 | .03 | .18 |
| 2007 | .03 | .17 |
| 2008 | .03 | .17 |
| 2009 | .03 | .17 |
| 2010 | .04 | .17 |
| 2011 | .03 | .16 |
| 2012 | .04 | .17 |
| 2013 | .03 | .16 |
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