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| year | production | consumption |
| 1986 | 8.40 | 6.70 |
| 1987 | 9.90 | 8.20 |
| 1988 | 9.90 | 8.80 |
| 1989 | 10.00 | 9.70 |
| 1990 | 11.00 | 12.00 |
| 1991 | 18.00 | 13.00 |
| 1992 | 20.00 | 15.00 |
| 1993 | 29.00 | 17.00 |
| 1994 | 19.00 | 19.00 |
| 1995 | 81.00 | 15.00 |
| 1996 | 92.00 | 24.00 |
| 1997 | 18.00 | 19.00 |
| 1998 | 76.00 | 26.00 |
| 1999 | 19.00 | 20.00 |
| 2000 | 27.00 | 31.00 |
| 2001 | 25.00 | 31.00 |
| 2002 | 38.00 | 26.00 |
| 2003 | 26.00 | 30.00 |
| 2004 | 28.00 | 37.00 |
| 2005 | 32.00 | 39.00 |
| 2006 | 13.00 | 39.00 |
| 2007 | 27.00 | 41.00 |
| 2008 | 25.00 | 58.00 |
| 2009 | 26.00 | 88.00 |
| 2010 | 22.00 | 120.00 |
| 2011 | 22.00 | 138.00 |
| 2012 | 21.00 | 160.00 |
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