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| year | production | consumption |
| 1986 | 76.00 | 2.80 |
| 1987 | .90 | 5.60 |
| 1988 | .90 | 5.20 |
| 1989 | 1.00 | 5.20 |
| 1990 | .70 | 3.50 |
| 1991 | .50 | 6.20 |
| 1992 | 40.00 | 6.50 |
| 1993 | 40.00 | 6.90 |
| 1994 | 106.00 | 9.00 |
| 1995 | 101.00 | 4.20 |
| 1996 | 112.00 | 3.90 |
| 1997 | 86.00 | 4.30 |
| 1998 | 101.00 | 4.80 |
| 1999 | 104.00 | 33.00 |
| 2000 | 114.00 | 32.00 |
| 2001 | 121.00 | 36.00 |
| 2002 | 124.00 | 36.00 |
| 2003 | 139.00 | 38.00 |
| 2004 | 144.00 | 39.00 |
| 2005 | 149.00 | 23.00 |
| 2006 | 4.90 | 4.80 |
| 2007 | 3.90 | 7.80 |
| 2008 | 4.00 | 8.50 |
| 2009 | 5.40 | 5.40 |
| 2010 | 5.60 | 67.00 |
| 2011 | 5.60 | 67.00 |
| 2012 | 5.50 | 75.00 |
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