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| year | production | consumption |
| 1980 | .00 | 967.00 |
| 1981 | .00 | 1,246.00 |
| 1982 | .00 | 1,275.00 |
| 1983 | .00 | 1,203.00 |
| 1984 | .00 | 1,222.00 |
| 1985 | .00 | 1,287.00 |
| 1986 | .00 | 1,301.00 |
| 1987 | .00 | 1,332.00 |
| 1988 | .00 | 1,529.00 |
| 1989 | .00 | 1,603.00 |
| 1990 | .00 | 1,477.00 |
| 1991 | .00 | 1,330.00 |
| 1992 | .00 | 1,345.00 |
| 1993 | .00 | 1,634.00 |
| 1994 | .00 | 2,041.00 |
| 1995 | .00 | 1,698.00 |
| 1996 | .00 | 2,068.00 |
| 1997 | .00 | 1,792.00 |
| 1998 | .00 | 1,631.00 |
| 1999 | 43.00 | 1,554.00 |
| 2000 | 64.00 | 2,017.00 |
| 2001 | 41.00 | 1,800.00 |
| 2002 | 41.00 | 1,930.00 |
| 2003 | 41.00 | 2,001.00 |
| 2004 | 36.00 | 2,046.00 |
| 2005 | 28.00 | 2,001.00 |
| 2006 | .00 | 1,995.00 |
| 2007 | .00 | 1,813.00 |
| 2008 | .00 | 1,633.00 |
| 2009 | .00 | 1,451.00 |
| 2010 | .00 | 1,088.00 |
| 2011 | .00 | 1,088.00 |
| 2012 | .00 | 998.00 |
| 2013 | 36.00 | 180.00 |
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