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| year | production | consumption |
| 1986 | 20.00 | 46.00 |
| 1987 | 22.00 | 48.00 |
| 1988 | 25.00 | 49.00 |
| 1989 | 24.00 | 51.00 |
| 1990 | 20.00 | 50.00 |
| 1991 | 18.00 | 44.00 |
| 1992 | 16.00 | 40.00 |
| 1993 | 16.00 | 39.00 |
| 1994 | 16.00 | 40.00 |
| 1995 | 15.00 | 36.00 |
| 1996 | 15.00 | 36.00 |
| 1997 | 4.40 | 34.00 |
| 1998 | 4.20 | 34.00 |
| 1999 | 4.60 | 35.00 |
| 2000 | 8.30 | 35.00 |
| 2001 | 9.80 | 33.00 |
| 2002 | 6.00 | 27.00 |
| 2003 | 9.10 | 32.00 |
| 2004 | 7.90 | 26.00 |
| 2005 | 7.50 | 25.00 |
| 2006 | 8.60 | 30.00 |
| 2007 | 11.00 | 35.00 |
| 2008 | 22.00 | 33.00 |
| 2009 | 26.00 | 26.00 |
| 2010 | 25.00 | 26.00 |
| 2011 | 25.00 | 25.00 |
| 2012 | 23.00 | 24.00 |
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