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| year | production | consumption |
| 1986 | 76.00 | 36.00 |
| 1987 | 81.00 | 33.00 |
| 1988 | 77.00 | 33.00 |
| 1989 | 66.00 | 28.00 |
| 1990 | 68.00 | 28.00 |
| 1991 | 69.00 | 24.00 |
| 1992 | 69.00 | 22.00 |
| 1993 | 63.00 | 21.00 |
| 1994 | 65.00 | 29.00 |
| 1995 | 54.00 | 30.00 |
| 1996 | 52.00 | 33.00 |
| 1997 | 51.00 | 34.00 |
| 1998 | 62.00 | 34.00 |
| 1999 | 51.00 | 38.00 |
| 2000 | 57.00 | 41.00 |
| 2001 | 67.00 | 38.00 |
| 2002 | 57.00 | 35.00 |
| 2003 | 59.00 | 31.00 |
| 2004 | 59.00 | 38.00 |
| 2005 | 54.00 | 31.00 |
| 2006 | 53.00 | 34.00 |
| 2007 | 51.00 | 25.00 |
| 2008 | 52.00 | 25.00 |
| 2009 | 43.00 | 24.00 |
| 2010 | 44.00 | 18.00 |
| 2011 | 44.00 | 20.00 |
| 2012 | 31.00 | 16.00 |
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