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Loading...
| year | production | consumption |
| 1981 | 5.40 | 5.40 |
| 1982 | 15.00 | 15.00 |
| 1983 | 27.00 | 27.00 |
| 1984 | 33.00 | 33.00 |
| 1985 | 40.00 | 40.00 |
| 1986 | 46.00 | 46.00 |
| 1987 | 53.00 | 53.00 |
| 1988 | 54.00 | 54.00 |
| 1989 | 55.00 | 55.00 |
| 1990 | 49.00 | 49.00 |
| 1991 | 57.00 | 57.00 |
| 1992 | 64.00 | 64.00 |
| 1993 | 75.00 | 75.00 |
| 1994 | 84.00 | 84.00 |
| 1995 | 89.00 | 90.00 |
| 1996 | 63.00 | 65.00 |
| 1997 | 84.00 | 82.00 |
| 1998 | 92.00 | 91.00 |
| 1999 | 96.00 | 94.00 |
| 2000 | 106.00 | 108.00 |
| 2001 | 115.00 | 114.00 |
| 2002 | 140.00 | 135.00 |
| 2003 | 183.00 | 184.00 |
| 2004 | 221.00 | 231.00 |
| 2005 | 255.00 | 265.00 |
| 2006 | 319.00 | 358.00 |
| 2007 | 425.00 | 449.00 |
| 2008 | 606.00 | 630.00 |
| 2009 | 713.00 | 720.00 |
| 2010 | 867.00 | 839.00 |
| 2011 | 909.00 | 841.00 |
| 2012 | 876.00 | 838.00 |
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