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| year | production | consumption |
| 1986 | 12.00 | 1.90 |
| 1987 | 13.00 | .40 |
| 1988 | 10.00 | 4.30 |
| 1989 | 16.00 | 4.70 |
| 1990 | 19.00 | 5.50 |
| 1991 | 18.00 | 4.00 |
| 1992 | 20.00 | 1.60 |
| 1993 | 16.00 | 1.90 |
| 1994 | 19.00 | 1.20 |
| 1995 | 19.00 | 1.00 |
| 1996 | 19.00 | 1.20 |
| 1998 | 19.00 | .80 |
| 1999 | 19.00 | .80 |
| 2000 | 18.00 | .80 |
| 2001 | 13.00 | .80 |
| 2002 | 15.00 | 1.50 |
| 2003 | 10.00 | 2.20 |
| 2004 | 13.00 | 2.40 |
| 2005 | 14.00 | 2.50 |
| 2006 | 16.00 | 3.80 |
| 2008 | 3.90 | .00 |
| 2009 | 6.20 | 1.80 |
| 2010 | 9.50 | 4.00 |
| 2011 | 7.90 | 3.80 |
| 2012 | 9.80 | 3.90 |
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