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| year | production | consumption |
| 1980 | .00 | 93.00 |
| 1981 | .00 | 173.00 |
| 1982 | .00 | 163.00 |
| 1983 | .00 | 435.00 |
| 1984 | .00 | 472.00 |
| 1985 | .00 | 633.00 |
| 1986 | 24.00 | 468.00 |
| 1987 | 96.00 | 572.00 |
| 1988 | 98.00 | 453.00 |
| 1989 | 120.00 | 1,959.00 |
| 1990 | 122.00 | 2,421.00 |
| 1991 | 198.00 | 2,626.00 |
| 1992 | 194.00 | 2,683.00 |
| 1993 | 133.00 | 2,331.00 |
| 1994 | 148.00 | 2,804.00 |
| 1995 | 123.00 | 2,722.00 |
| 1996 | 241.00 | 4,248.00 |
| 1997 | 240.00 | 2,653.00 |
| 1998 | 347.00 | 2,776.00 |
| 1999 | 273.00 | 1,412.00 |
| 2000 | 423.00 | 3,725.00 |
| 2001 | 602.00 | 4,927.00 |
| 2002 | 389.00 | 8,092.00 |
| 2003 | 193.00 | 4,377.00 |
| 2004 | 429.00 | 6,795.00 |
| 2005 | 869.00 | 12,049.00 |
| 2006 | 993.00 | 12,269.00 |
| 2007 | 1,185.00 | 15,861.00 |
| 2008 | 1,382.00 | 16,101.00 |
| 2009 | 2,357.00 | 18,600.00 |
| 2010 | 2,642.00 | 25,222.00 |
| 2011 | 3,214.00 | 28,662.00 |
| 2012 | 3,252.00 | 27,468.00 |
| 2013 | 3,256.00 | 28,160.00 |
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