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| year | production | consumption |
| 1986 | 100.00 | 142.00 |
| 1987 | 108.00 | 153.00 |
| 1988 | 110.00 | 168.00 |
| 1989 | 117.00 | 173.00 |
| 1990 | 116.00 | 178.00 |
| 1991 | 115.00 | 175.00 |
| 1992 | 114.00 | 198.00 |
| 1993 | 114.00 | 182.00 |
| 1994 | 110.00 | 206.00 |
| 1995 | 112.00 | 198.00 |
| 1996 | 132.00 | 203.00 |
| 1997 | 135.00 | 212.00 |
| 1998 | 134.00 | 250.00 |
| 1999 | 119.00 | 227.00 |
| 2000 | 176.00 | 239.00 |
| 2001 | 205.00 | 214.00 |
| 2002 | 212.00 | 220.00 |
| 2003 | 216.00 | 217.00 |
| 2004 | 196.00 | 198.00 |
| 2005 | 192.00 | 202.00 |
| 2006 | 180.00 | 210.00 |
| 2007 | .00 | .00 |
| 2008 | 174.00 | 203.00 |
| 2009 | 187.00 | 207.00 |
| 2010 | 168.00 | 191.00 |
| 2011 | 164.00 | 179.00 |
| 2012 | 167.00 | 167.00 |
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