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| year | production | consumption |
| 1980 | .00 | .00 |
| 1981 | .00 | .00 |
| 1982 | .00 | .00 |
| 1983 | .00 | .00 |
| 1984 | .00 | 28.00 |
| 1985 | .00 | 37.00 |
| 1986 | .00 | 62.00 |
| 1987 | .00 | 55.00 |
| 1988 | .00 | 44.00 |
| 1989 | .00 | 73.00 |
| 1990 | .00 | 62.00 |
| 1991 | .00 | 66.00 |
| 1992 | .00 | 67.00 |
| 1993 | .00 | 68.00 |
| 1994 | .00 | 69.00 |
| 1995 | .00 | 69.00 |
| 1996 | .00 | 44.00 |
| 1997 | .00 | 51.00 |
| 1998 | .00 | 78.00 |
| 1999 | .00 | 150.00 |
| 2000 | .00 | 279.00 |
| 2001 | .00 | 330.00 |
| 2002 | .00 | 345.00 |
| 2003 | .00 | 348.00 |
| 2004 | .00 | 319.00 |
| 2005 | .00 | 401.00 |
| 2006 | .00 | 535.00 |
| 2007 | .00 | 632.00 |
| 2008 | .00 | 719.00 |
| 2009 | .00 | 657.00 |
| 2010 | .00 | 736.00 |
| 2011 | .00 | 707.00 |
| 2012 | .00 | 744.00 |
| 2013 | .00 | 783.00 |
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