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Loading...
| year | production | consumption |
| 1980 | .00 | .00 |
| 1981 | .40 | .40 |
| 1982 | 2.30 | 2.30 |
| 1983 | 2.30 | 2.30 |
| 1984 | 2.10 | 2.10 |
| 1985 | 1.40 | 1.40 |
| 1986 | 1.40 | 1.40 |
| 1987 | 1.40 | 1.40 |
| 1988 | 1.10 | 1.10 |
| 1989 | 1.10 | 1.10 |
| 1990 | 1.40 | 1.40 |
| 1991 | 2.50 | 2.50 |
| 1992 | 7.40 | 7.40 |
| 1993 | 8.80 | 8.80 |
| 1994 | 8.80 | 8.80 |
| 1995 | 25.00 | 25.00 |
| 1996 | 29.00 | 29.00 |
| 1997 | 8.10 | 8.10 |
| 1998 | 25.00 | 25.00 |
| 1999 | 35.00 | 35.00 |
| 2000 | 41.00 | 41.00 |
| 2001 | 46.00 | 46.00 |
| 2002 | 80.00 | 80.00 |
| 2003 | 95.00 | 95.00 |
| 2004 | 106.00 | 106.00 |
| 2005 | 141.00 | 141.00 |
| 2006 | 201.00 | 201.00 |
| 2007 | 208.00 | 208.00 |
| 2008 | 246.00 | 246.00 |
| 2009 | 250.00 | 250.00 |
| 2010 | 290.00 | 290.00 |
| 2011 | 272.00 | 272.00 |
| 2012 | 297.00 | 297.00 |
| 2013 | 311.00 | 311.00 |
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