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Loading...
| year | production | consumption |
| 1980 | .00 | 45.00 |
| 1981 | .00 | 46.00 |
| 1982 | .00 | 54.00 |
| 1983 | .00 | 50.00 |
| 1984 | .00 | 62.00 |
| 1985 | .00 | 69.00 |
| 1986 | 10.00 | 67.00 |
| 1987 | 20.00 | 66.00 |
| 1988 | 173.00 | 68.00 |
| 1989 | 194.00 | 74.00 |
| 1990 | 193.00 | 76.00 |
| 1991 | 197.00 | 78.00 |
| 1992 | 182.00 | 83.00 |
| 1993 | 220.00 | 69.00 |
| 1994 | 335.00 | 66.00 |
| 1995 | 345.00 | 72.00 |
| 1996 | 340.00 | 74.00 |
| 1997 | 362.00 | 79.00 |
| 1998 | 388.00 | 85.00 |
| 1999 | 409.00 | 89.00 |
| 2000 | 438.00 | 97.00 |
| 2001 | 441.00 | 102.00 |
| 2002 | 439.00 | 112.00 |
| 2003 | 429.00 | 121.00 |
| 2004 | 404.00 | 123.00 |
| 2005 | 400.00 | 128.00 |
| 2006 | 375.00 | 140.00 |
| 2007 | 319.00 | 121.00 |
| 2008 | 298.00 | 147.00 |
| 2009 | 285.00 | 131.00 |
| 2010 | 280.00 | 162.00 |
| 2011 | 216.00 | 135.00 |
| 2012 | 169.00 | 130.00 |
| 2013 | 131.00 | 134.00 |
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