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| year | production | consumption |
| 1986 | 108.00 | 97.00 |
| 1987 | 100.00 | 99.00 |
| 1988 | 99.00 | 88.00 |
| 1989 | 94.00 | 68.00 |
| 1990 | 85.00 | 63.00 |
| 1991 | 77.00 | 65.00 |
| 1992 | 81.00 | 49.00 |
| 1993 | 68.00 | 54.00 |
| 1994 | 56.00 | 43.00 |
| 1995 | 49.00 | 36.00 |
| 1996 | 42.00 | 39.00 |
| 1997 | 38.00 | 51.00 |
| 1998 | 52.00 | 49.00 |
| 1999 | 54.00 | 44.00 |
| 2000 | 47.00 | 37.00 |
| 2001 | 52.00 | 32.00 |
| 2002 | 38.00 | 23.00 |
| 2003 | 43.00 | 30.00 |
| 2004 | 14.00 | 33.00 |
| 2005 | 54.00 | 47.00 |
| 2006 | 70.00 | 49.00 |
| 2007 | 78.00 | 62.00 |
| 2008 | 86.00 | 75.00 |
| 2009 | 67.00 | 60.00 |
| 2010 | 75.00 | 77.00 |
| 2011 | 70.00 | 82.00 |
| 2012 | 81.00 | 93.00 |
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