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| year | production | consumption |
| 1986 | 163.00 | 118.00 |
| 1987 | 163.00 | 119.00 |
| 1988 | 164.00 | 118.00 |
| 1989 | 166.00 | 118.00 |
| 1990 | 156.00 | 163.00 |
| 1991 | 101.00 | 114.00 |
| 1992 | 90.00 | 94.00 |
| 1993 | 73.00 | 101.00 |
| 1994 | 65.00 | 91.00 |
| 1995 | 58.00 | 88.00 |
| 1996 | 47.00 | 84.00 |
| 1997 | 41.00 | 106.00 |
| 1998 | 39.00 | 83.00 |
| 1999 | 36.00 | 61.00 |
| 2000 | 29.00 | 51.00 |
| 2001 | 46.00 | 74.00 |
| 2002 | 37.00 | 58.00 |
| 2003 | 29.00 | 44.00 |
| 2004 | 28.00 | 34.00 |
| 2005 | 31.00 | 30.00 |
| 2006 | 24.00 | 25.00 |
| 2007 | 22.00 | 14.00 |
| 2008 | 21.00 | 8.90 |
| 2009 | 16.00 | 13.00 |
| 2010 | 14.00 | 11.00 |
| 2011 | 13.00 | 12.00 |
| 2012 | 10.00 | 11.00 |
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