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Loading...
| year | production | consumption |
| 1980 | .00 | 24.00 |
| 1981 | .00 | 26.00 |
| 1982 | .00 | 26.00 |
| 1983 | .00 | 27.00 |
| 1984 | .00 | 27.00 |
| 1985 | .00 | 28.00 |
| 1986 | .80 | 29.00 |
| 1987 | 5.00 | 35.00 |
| 1988 | 15.00 | 40.00 |
| 1989 | 32.00 | 46.00 |
| 1990 | 50.00 | 53.00 |
| 1991 | 80.00 | 56.00 |
| 1992 | 106.00 | 61.00 |
| 1993 | 120.00 | 77.00 |
| 1994 | 141.00 | 85.00 |
| 1995 | 173.00 | 94.00 |
| 1996 | 175.00 | 116.00 |
| 1997 | 191.00 | 129.00 |
| 1998 | 246.00 | 135.00 |
| 1999 | 290.00 | 159.00 |
| 2000 | 316.00 | 176.00 |
| 2001 | 357.00 | 179.00 |
| 2002 | 340.00 | 193.00 |
| 2003 | 353.00 | 215.00 |
| 2004 | 403.00 | 256.00 |
| 2005 | 372.00 | 267.00 |
| 2006 | 345.00 | 262.00 |
| 2007 | 319.00 | 304.00 |
| 2008 | 300.00 | 302.00 |
| 2009 | 328.00 | 357.00 |
| 2010 | 318.00 | 412.00 |
| 2011 | 309.00 | 428.00 |
| 2012 | 347.00 | 453.00 |
| 2013 | 337.00 | 471.00 |
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