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| year | production | consumption |
| 1986 | 54.00 | 1.90 |
| 1987 | 45.00 | 2.30 |
| 1988 | 44.00 | 1.80 |
| 1989 | 42.00 | 3.60 |
| 1990 | 46.00 | 1.80 |
| 1991 | 56.00 | 1.40 |
| 1992 | 63.00 | 3.60 |
| 1993 | 50.00 | 3.00 |
| 1994 | 46.00 | 5.90 |
| 1995 | 44.00 | 6.30 |
| 1996 | 47.00 | 3.30 |
| 1997 | 47.00 | 3.40 |
| 1998 | 47.00 | 2.20 |
| 1999 | 61.00 | 2.00 |
| 2000 | 62.00 | 3.50 |
| 2001 | 65.00 | 2.00 |
| 2002 | 60.00 | 1.90 |
| 2003 | 61.00 | 8.00 |
| 2004 | 56.00 | 8.00 |
| 2005 | 60.00 | 8.60 |
| 2006 | 56.00 | 5.60 |
| 2007 | 55.00 | 3.20 |
| 2008 | 55.00 | 5.40 |
| 2009 | 48.00 | 5.80 |
| 2010 | 42.00 | 4.50 |
| 2011 | 47.00 | 5.10 |
| 2012 | 43.00 | 7.40 |
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