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| year | production | consumption |
| 1992 | 3.60 | 11.00 |
| 1993 | 1.90 | 5.80 |
| 1994 | 1.50 | 1.90 |
| 1995 | .30 | 1.80 |
| 1996 | .10 | 2.00 |
| 1997 | .20 | 1.50 |
| 1998 | .30 | 2.10 |
| 1999 | .50 | 2.80 |
| 2000 | 1.30 | 4.50 |
| 2001 | 4.50 | 10.00 |
| 2002 | .20 | .20 |
| 2003 | .20 | .20 |
| 2004 | .30 | .30 |
| 2005 | .30 | .30 |
| 2007 | .20 | .50 |
| 2008 | .30 | .50 |
| 2010 | .00 | .50 |
| 2011 | .00 | .10 |
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