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| year | production | consumption |
| 1980 | 195.00 | 657.00 |
| 1981 | 203.00 | 627.00 |
| 1982 | 196.00 | 586.00 |
| 1983 | 204.00 | 670.00 |
| 1984 | 214.00 | 631.00 |
| 1985 | 261.00 | 1,140.00 |
| 1986 | 260.00 | 2,432.00 |
| 1987 | 288.00 | 3,161.00 |
| 1988 | 254.00 | 3,688.00 |
| 1989 | 284.00 | 4,723.00 |
| 1990 | 310.00 | 4,852.00 |
| 1991 | 298.00 | 5,144.00 |
| 1992 | 244.00 | 5,183.00 |
| 1993 | 217.00 | 5,459.00 |
| 1994 | 162.00 | 5,760.00 |
| 1995 | .00 | 6,292.00 |
| 1996 | .00 | 6,031.00 |
| 1997 | .00 | 6,139.00 |
| 1998 | .00 | 5,621.00 |
| 1999 | .00 | 6,753.00 |
| 2000 | .00 | 6,790.00 |
| 2001 | .00 | 5,671.00 |
| 2002 | .00 | 6,248.00 |
| 2003 | .00 | 5,919.00 |
| 2004 | .00 | 6,186.00 |
| 2005 | .00 | 6,061.00 |
| 2006 | .00 | 6,038.00 |
| 2007 | .00 | 5,250.00 |
| 2008 | .00 | 4,598.00 |
| 2009 | .00 | 5,165.00 |
| 2010 | .00 | 2,997.00 |
| 2011 | .00 | 4,052.00 |
| 2012 | .00 | 5,381.00 |
| 2013 | .00 | 4,915.00 |
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