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| year | production | consumption |
| 1986 | 34.00 | 66.00 |
| 1987 | 34.00 | 79.00 |
| 1988 | 35.00 | 86.00 |
| 1989 | 34.00 | 92.00 |
| 1990 | 35.00 | 91.00 |
| 1991 | 35.00 | 88.00 |
| 1992 | 29.00 | 91.00 |
| 1993 | 34.00 | 112.00 |
| 1994 | 36.00 | 121.00 |
| 1995 | 34.00 | 126.00 |
| 1996 | 35.00 | 138.00 |
| 1997 | 35.00 | 136.00 |
| 1998 | 33.00 | 133.00 |
| 1999 | 33.00 | 140.00 |
| 2000 | 51.00 | 148.00 |
| 2001 | 50.00 | 147.00 |
| 2002 | 66.00 | 148.00 |
| 2003 | 67.00 | 152.00 |
| 2004 | 73.00 | 159.00 |
| 2005 | 72.00 | 153.00 |
| 2006 | 69.00 | 148.00 |
| 2007 | 74.00 | 165.00 |
| 2008 | 68.00 | 160.00 |
| 2009 | 66.00 | 151.00 |
| 2010 | 67.00 | 138.00 |
| 2011 | 67.00 | 140.00 |
| 2012 | 80.00 | 140.00 |
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