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| year | production | consumption |
| 1992 | .00 | 33.00 |
| 1993 | .05 | 40.00 |
| 1994 | .04 | 43.00 |
| 1995 | .04 | 48.00 |
| 1996 | .02 | 56.00 |
| 1997 | .03 | 55.00 |
| 1998 | .02 | 52.00 |
| 1999 | .02 | 52.00 |
| 2000 | .02 | 50.00 |
| 2001 | .01 | 52.00 |
| 2002 | .01 | 51.00 |
| 2003 | .01 | 51.00 |
| 2004 | .01 | 52.00 |
| 2005 | .01 | 54.00 |
| 2006 | .01 | 56.00 |
| 2007 | .01 | 55.00 |
| 2008 | .01 | 64.00 |
| 2009 | .01 | 54.00 |
| 2010 | .01 | 56.00 |
| 2011 | .01 | 55.00 |
| 2012 | .01 | 54.00 |
| 2013 | .01 | 52.00 |
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