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| year | production | consumption |
| 1986 | 10.20 | 17.40 |
| 1987 | 10.10 | 19.10 |
| 1988 | 8.40 | 19.20 |
| 1989 | 9.80 | 20.50 |
| 1990 | 9.90 | 20.40 |
| 1991 | 9.60 | 21.40 |
| 1992 | 10.60 | 20.80 |
| 1993 | 9.10 | 22.40 |
| 1994 | 8.30 | 30.40 |
| 1995 | 7.70 | 22.80 |
| 1996 | 9.70 | 34.00 |
| 1997 | 6.40 | 36.50 |
| 1998 | 8.20 | 37.30 |
| 1999 | 9.00 | 42.90 |
| 2000 | 11.10 | 47.40 |
| 2001 | 9.80 | 46.90 |
| 2002 | 10.20 | 45.90 |
| 2003 | 9.40 | 48.80 |
| 2004 | 7.20 | 54.20 |
| 2005 | 8.70 | 48.30 |
| 2006 | 30.10 | 55.20 |
| 2007 | 7.70 | 69.20 |
| 2008 | 8.00 | 72.30 |
| 2009 | 6.60 | 57.90 |
| 2010 | 6.00 | 62.10 |
| 2011 | 4.50 | 57.50 |
| 2012 | 2.70 | 58.30 |
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