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| year | production | consumption |
| 1986 | 6.80 | 6.60 |
| 1987 | 6.70 | 6.60 |
| 1988 | 3.20 | 3.40 |
| 1989 | 3.70 | 3.60 |
| 1990 | 3.80 | 2.40 |
| 1991 | 7.20 | 1.30 |
| 1992 | 7.30 | 1.00 |
| 1993 | 13.00 | 1.30 |
| 1994 | 13.00 | 1.60 |
| 1995 | 10.00 | 1.60 |
| 1996 | 4.80 | 1.40 |
| 1997 | 16.00 | 1.20 |
| 1998 | 19.00 | 1.20 |
| 1999 | 19.00 | 1.30 |
| 2000 | 11.00 | 1.50 |
| 2001 | 12.00 | 1.10 |
| 2002 | 12.00 | 1.20 |
| 2003 | 13.00 | 1.20 |
| 2004 | 20.00 | 1.60 |
| 2005 | 17.00 | 1.90 |
| 2006 | 21.00 | 3.10 |
| 2007 | 20.00 | 3.80 |
| 2008 | 16.00 | 1.80 |
| 2009 | 15.00 | 1.70 |
| 2010 | 1.40 | 1.40 |
| 2011 | 1.00 | 1.00 |
| 2012 | 1.20 | 1.20 |
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