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| year | production | consumption |
| 1992 | 3.50 | 67.00 |
| 1993 | .00 | 49.00 |
| 1994 | 1.20 | 58.00 |
| 1995 | 1.40 | 29.00 |
| 1996 | 1.00 | 43.00 |
| 1997 | 1.40 | 40.00 |
| 1998 | 2.10 | 40.00 |
| 1999 | 2.10 | 41.00 |
| 2000 | 1.40 | 44.00 |
| 2001 | 1.80 | 46.00 |
| 2002 | .70 | 42.00 |
| 2003 | 1.40 | 48.00 |
| 2004 | 1.40 | 49.00 |
| 2005 | 1.40 | 51.00 |
| 2006 | 1.30 | 45.00 |
| 2007 | .70 | 23.00 |
| 2008 | 1.10 | 15.00 |
| 2009 | 1.30 | 8.00 |
| 2010 | 1.40 | 8.00 |
| 2011 | .70 | 7.00 |
| 2012 | .50 | 7.20 |
| 2013 | .50 | 7.50 |
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