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| year | production | consumption |
| 1992 | .60 | 24.00 |
| 1993 | .70 | 30.00 |
| 1994 | .40 | 29.00 |
| 1995 | .40 | 35.00 |
| 1996 | .40 | 45.00 |
| 1997 | .50 | 32.00 |
| 1998 | .30 | 34.00 |
| 1999 | .00 | 35.00 |
| 2000 | .00 | 36.00 |
| 2001 | .00 | 37.00 |
| 2002 | .00 | 34.00 |
| 2003 | .20 | 36.00 |
| 2004 | .20 | 38.00 |
| 2005 | .10 | 40.00 |
| 2006 | .10 | 39.00 |
| 2007 | .10 | 40.00 |
| 2008 | .10 | 38.00 |
| 2009 | .10 | 36.00 |
| 2010 | .20 | 37.00 |
| 2011 | .07 | 32.00 |
| 2012 | .07 | 31.00 |
| 2013 | .10 | 30.00 |
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