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| year | production | consumption |
| 1986 | 25.00 | 6.90 |
| 1987 | 21.00 | 5.80 |
| 1988 | 25.00 | 3.60 |
| 1989 | 25.00 | 4.10 |
| 1990 | 29.00 | 5.50 |
| 1991 | 30.00 | 8.50 |
| 1992 | 29.00 | 8.70 |
| 1993 | 24.00 | 8.40 |
| 1994 | 35.00 | 16.00 |
| 1995 | 39.00 | 15.00 |
| 1996 | 39.00 | 10.00 |
| 1997 | 35.00 | 12.00 |
| 1998 | 39.00 | 9.60 |
| 1999 | 42.00 | 13.00 |
| 2000 | 37.00 | 10.00 |
| 2001 | 34.00 | 8.00 |
| 2002 | 41.00 | 10.00 |
| 2003 | 42.00 | 8.00 |
| 2004 | 39.00 | 19.00 |
| 2005 | 35.00 | 20.00 |
| 2006 | 37.00 | 24.00 |
| 2007 | 34.00 | 27.00 |
| 2008 | 54.00 | 35.00 |
| 2009 | 41.00 | 21.00 |
| 2010 | 49.00 | 43.00 |
| 2011 | 54.00 | 44.00 |
| 2012 | 52.00 | 43.00 |
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