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| year | production | consumption |
| 1986 | 53.40 | 92.30 |
| 1987 | 55.60 | 93.20 |
| 1988 | 58.60 | 107.10 |
| 1989 | 57.10 | 104.60 |
| 1990 | 67.10 | 108.60 |
| 1991 | 72.50 | 121.10 |
| 1992 | 77.20 | 131.70 |
| 1993 | 76.90 | 143.60 |
| 1994 | 79.70 | 118.10 |
| 1995 | 87.40 | 133.10 |
| 1996 | 80.00 | 125.70 |
| 1997 | 74.50 | 156.70 |
| 1998 | 93.90 | 173.80 |
| 1999 | 101.50 | 163.50 |
| 2000 | 68.90 | 214.80 |
| 2001 | 73.00 | 231.40 |
| 2002 | 77.20 | 237.20 |
| 2003 | 76.10 | 220.50 |
| 2004 | 74.90 | 210.20 |
| 2005 | 78.90 | 234.00 |
| 2006 | 125.90 | 264.70 |
| 2007 | 70.40 | 295.20 |
| 2008 | 71.90 | 323.40 |
| 2009 | 68.50 | 312.40 |
| 2010 | 71.00 | 349.00 |
| 2011 | 59.00 | 344.10 |
| 2012 | 57.50 | 289.90 |
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