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| year | production | consumption |
| 1986 | 60.00 | 7.60 |
| 1987 | 68.00 | 17.00 |
| 1988 | 64.00 | 20.00 |
| 1989 | 66.00 | 18.00 |
| 1990 | 66.00 | 18.00 |
| 1991 | 78.00 | 14.00 |
| 1992 | 70.00 | 19.00 |
| 1993 | 67.00 | 13.00 |
| 1994 | 58.00 | 8.80 |
| 1995 | 62.00 | 14.00 |
| 1996 | 56.00 | 5.70 |
| 1997 | 58.00 | 7.40 |
| 1998 | 55.00 | 8.50 |
| 1999 | 61.00 | 9.80 |
| 2000 | 57.00 | 11.00 |
| 2001 | 61.00 | 13.00 |
| 2002 | 61.00 | 14.00 |
| 2003 | 58.00 | 8.90 |
| 2004 | 65.00 | 7.70 |
| 2005 | 60.00 | 9.90 |
| 2006 | 55.00 | 11.00 |
| 2007 | 61.00 | 18.00 |
| 2008 | 61.00 | 3.10 |
| 2009 | 63.00 | 6.70 |
| 2010 | 71.00 | 8.60 |
| 2011 | 77.00 | 7.70 |
| 2012 | 80.00 | 17.00 |
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