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| year | production | consumption |
| 1986 | 40.00 | 40.00 |
| 1987 | 41.00 | 41.00 |
| 1988 | 40.00 | 40.00 |
| 1989 | 51.00 | 33.00 |
| 1990 | 33.00 | 31.00 |
| 1991 | 16.00 | 17.00 |
| 1992 | 23.00 | 20.00 |
| 1993 | 28.00 | 21.00 |
| 1994 | 29.00 | 23.00 |
| 1995 | 35.00 | 27.00 |
| 1996 | 45.00 | 23.00 |
| 1997 | 26.00 | 20.00 |
| 1998 | 22.00 | 19.00 |
| 1999 | 25.00 | 18.00 |
| 2000 | 24.00 | 15.00 |
| 2001 | 28.00 | 14.00 |
| 2002 | 31.00 | 21.00 |
| 2003 | 23.00 | 14.00 |
| 2004 | 33.00 | 13.00 |
| 2005 | 32.00 | 15.00 |
| 2006 | 36.00 | 14.00 |
| 2007 | 34.00 | 14.00 |
| 2008 | 37.00 | 14.00 |
| 2009 | 34.00 | 15.00 |
| 2010 | 35.00 | 14.00 |
| 2011 | 36.00 | 13.00 |
| 2012 | 39.00 | 12.00 |
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