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| year | production | consumption |
| 1980 | .00 | 312.00 |
| 1981 | .00 | 324.00 |
| 1982 | .00 | 349.00 |
| 1983 | .00 | 338.00 |
| 1984 | .00 | 360.00 |
| 1985 | .00 | 350.00 |
| 1986 | .00 | 350.00 |
| 1987 | .00 | 345.00 |
| 1988 | .00 | 342.00 |
| 1989 | .00 | 348.00 |
| 1990 | .00 | 375.00 |
| 1991 | .00 | 403.00 |
| 1992 | .00 | 412.00 |
| 1993 | .00 | 402.00 |
| 1994 | .00 | 410.00 |
| 1995 | .00 | 421.00 |
| 1996 | .00 | 428.00 |
| 1997 | .00 | 439.00 |
| 1998 | 18.00 | 451.00 |
| 1999 | 25.00 | 466.00 |
| 2000 | 26.00 | 458.00 |
| 2001 | 26.00 | 458.00 |
| 2002 | 19.00 | 475.00 |
| 2003 | 30.00 | 490.00 |
| 2004 | 56.00 | 504.00 |
| 2005 | 34.00 | 537.00 |
| 2006 | 20.00 | 551.00 |
| 2007 | 16.00 | 569.00 |
| 2008 | 15.00 | 589.00 |
| 2009 | 4.00 | 548.00 |
| 2010 | 3.50 | 584.00 |
| 2011 | 4.00 | 616.00 |
| 2012 | 3.90 | 638.00 |
| 2013 | 3.60 | 612.00 |
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