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| year | production | consumption |
| 1986 | 115.00 | 133.00 |
| 1987 | 111.00 | 130.00 |
| 1988 | 111.00 | 130.00 |
| 1989 | 64.00 | 82.00 |
| 1990 | 46.00 | 64.00 |
| 1991 | 33.00 | 48.00 |
| 1992 | 34.00 | 43.00 |
| 1993 | 35.00 | 38.00 |
| 1994 | 43.00 | 46.00 |
| 1995 | 40.00 | 41.00 |
| 1996 | 33.00 | 25.00 |
| 1997 | 29.00 | 29.00 |
| 1998 | 26.00 | 25.00 |
| 1999 | 25.00 | 22.00 |
| 2000 | 29.00 | 36.00 |
| 2001 | 38.00 | 29.00 |
| 2002 | 26.00 | 16.00 |
| 2003 | 15.00 | 8.70 |
| 2004 | 19.00 | 10.00 |
| 2005 | 24.00 | 13.00 |
| 2006 | 30.00 | 7.90 |
| 2007 | 32.00 | 8.70 |
| 2008 | 29.00 | 5.90 |
| 2009 | 30.00 | 10.00 |
| 2010 | 28.00 | 4.60 |
| 2011 | 28.00 | 4.00 |
| 2012 | 29.00 | 4.10 |
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