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| year | production | consumption |
| 1986 | 7.20 | 1.40 |
| 1987 | 7.70 | 1.30 |
| 1988 | 6.20 | 2.80 |
| 1989 | 6.60 | 2.90 |
| 1990 | 6.80 | 2.90 |
| 1991 | 8.50 | 3.50 |
| 1992 | 8.60 | 4.60 |
| 1993 | 9.80 | 12.00 |
| 1994 | 13.00 | 18.00 |
| 1995 | 13.00 | 16.00 |
| 1996 | 13.00 | 19.00 |
| 1997 | 15.00 | 13.00 |
| 1998 | 13.00 | 3.20 |
| 1999 | 85.00 | 3.10 |
| 2000 | 15.00 | 26.00 |
| 2001 | 25.00 | 29.00 |
| 2002 | 266.00 | 12.00 |
| 2003 | 18.00 | 40.00 |
| 2004 | 18.00 | 38.00 |
| 2005 | 17.00 | 29.00 |
| 2006 | 38.00 | 28.00 |
| 2007 | 5.60 | 31.00 |
| 2008 | 9.80 | 37.00 |
| 2009 | 17.00 | 28.00 |
| 2010 | 19.00 | 49.00 |
| 2011 | 23.00 | 52.00 |
| 2012 | 19.00 | 48.00 |
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