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Loading...
| year | production | consumption |
| 1980 | .00 | .00 |
| 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 | 94.60 |
| 1999 | 97.70 | 98.20 |
| 2000 | 109.70 | 112.50 |
| 2001 | 118.90 | 118.50 |
| 2002 | 144.00 | 139.50 |
| 2003 | 187.00 | 188.90 |
| 2004 | 225.00 | 235.90 |
| 2005 | 259.40 | 270.80 |
| 2006 | 323.40 | 362.60 |
| 2007 | 439.00 | 469.00 |
| 2008 | 621.00 | 654.00 |
| 2009 | 733.00 | 746.00 |
| 2010 | 891.30 | 871.30 |
| 2011 | 939.30 | 883.30 |
| 2012 | 909.00 | 879.30 |
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