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| year | production | consumption |
| 1986 | 271.00 | 67.00 |
| 1987 | 212.00 | 68.00 |
| 1988 | 290.00 | 67.00 |
| 1989 | 274.00 | 66.00 |
| 1990 | 258.00 | 60.00 |
| 1991 | 295.00 | 60.00 |
| 1992 | 260.00 | 60.00 |
| 1993 | 272.00 | 40.00 |
| 1994 | 269.00 | 51.00 |
| 1995 | 307.00 | 59.00 |
| 1996 | 281.00 | 59.00 |
| 1997 | 282.00 | 36.00 |
| 1998 | 213.00 | 45.00 |
| 1999 | 230.00 | 39.00 |
| 2000 | 265.00 | 41.00 |
| 2001 | 281.00 | 55.00 |
| 2002 | 278.00 | 65.00 |
| 2003 | 218.00 | 59.00 |
| 2004 | 278.00 | 55.00 |
| 2005 | 266.00 | 57.00 |
| 2006 | 279.00 | 64.00 |
| 2007 | 267.00 | 67.00 |
| 2008 | 280.00 | 62.00 |
| 2009 | 313.00 | 106.00 |
| 2010 | 273.00 | 107.00 |
| 2011 | 300.00 | 124.00 |
| 2012 | 284.00 | 98.00 |
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