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| year | production | consumption |
| 1986 | 1.20 | 2.10 |
| 1987 | 14.00 | 32.00 |
| 1988 | 18.00 | 48.00 |
| 1989 | 17.00 | 41.00 |
| 1990 | 19.00 | 42.00 |
| 1991 | 22.00 | 46.00 |
| 1992 | 27.00 | 50.00 |
| 1993 | 25.00 | 12.00 |
| 1994 | 28.00 | 51.00 |
| 1995 | 29.00 | 56.00 |
| 1996 | 29.00 | 46.00 |
| 1997 | 26.00 | 35.00 |
| 1998 | 32.00 | 10.00 |
| 1999 | 33.00 | 58.00 |
| 2000 | 36.00 | 50.00 |
| 2001 | 93.00 | 47.00 |
| 2002 | 110.00 | 66.00 |
| 2003 | 95.00 | 47.00 |
| 2004 | 120.00 | 86.00 |
| 2005 | 80.00 | 26.00 |
| 2006 | 31.00 | 88.00 |
| 2007 | 30.00 | 103.00 |
| 2008 | .00 | .00 |
| 2009 | 29.00 | 78.00 |
| 2010 | 25.00 | 85.00 |
| 2011 | 26.00 | 71.00 |
| 2012 | 33.00 | 93.00 |
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