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| year | production | consumption |
| 1986 | 16.00 | 35.00 |
| 1987 | 17.00 | 36.00 |
| 1988 | 14.00 | 40.00 |
| 1989 | 14.00 | 42.00 |
| 1990 | 14.00 | 43.00 |
| 1991 | 16.00 | 42.00 |
| 1992 | 16.00 | 43.00 |
| 1993 | 19.00 | 47.00 |
| 1994 | 21.00 | 46.00 |
| 1995 | 24.00 | 47.00 |
| 1996 | 25.00 | 48.00 |
| 1997 | 27.00 | 50.00 |
| 1998 | 27.00 | 49.00 |
| 1999 | 26.00 | 51.00 |
| 2000 | 31.00 | 51.00 |
| 2001 | 35.00 | 51.00 |
| 2002 | 38.00 | 55.00 |
| 2003 | 42.00 | 55.00 |
| 2004 | 45.00 | 61.00 |
| 2005 | 47.00 | 66.00 |
| 2006 | 44.00 | 68.00 |
| 2007 | 51.00 | 76.00 |
| 2008 | 40.00 | 63.00 |
| 2009 | 49.00 | 73.00 |
| 2010 | 41.00 | 67.00 |
| 2011 | 36.00 | 69.00 |
| 2012 | 41.00 | 61.00 |
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