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| year | production | consumption |
| 1992 | .70 | 177.00 |
| 1993 | .00 | 85.00 |
| 1994 | .00 | 57.00 |
| 1995 | .00 | 74.00 |
| 1996 | .00 | 64.00 |
| 1997 | 2.10 | 13.00 |
| 1998 | 2.10 | 66.00 |
| 1999 | 2.10 | 41.00 |
| 2000 | 2.10 | 43.00 |
| 2001 | 2.10 | 41.00 |
| 2002 | .50 | 48.00 |
| 2003 | .70 | 36.00 |
| 2004 | .70 | 43.00 |
| 2005 | .50 | 52.00 |
| 2006 | .40 | 50.00 |
| 2007 | .40 | 60.00 |
| 2008 | .40 | 61.00 |
| 2009 | .40 | 60.00 |
| 2010 | .40 | 58.00 |
| 2011 | .20 | 53.00 |
| 2012 | .00 | 63.00 |
| 2013 | .00 | 72.00 |
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