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| year | production | consumption |
| 1980 | .00 | 537.00 |
| 1981 | .00 | 536.00 |
| 1982 | .00 | 534.00 |
| 1983 | .00 | 561.00 |
| 1984 | .00 | 554.00 |
| 1985 | .00 | 552.00 |
| 1986 | .00 | 592.00 |
| 1987 | .00 | 627.00 |
| 1988 | .00 | 746.00 |
| 1989 | .00 | 860.00 |
| 1990 | .00 | 1,048.00 |
| 1991 | .00 | 1,263.00 |
| 1992 | .00 | 1,527.00 |
| 1993 | .00 | 1,684.00 |
| 1994 | .00 | 1,840.00 |
| 1995 | .00 | 2,008.00 |
| 1996 | .00 | 2,101.00 |
| 1997 | .00 | 2,255.00 |
| 1998 | .00 | 1,917.00 |
| 1999 | .00 | 2,084.00 |
| 2000 | .00 | 2,135.00 |
| 2001 | .00 | 2,132.00 |
| 2002 | .00 | 2,149.00 |
| 2003 | .00 | 2,175.00 |
| 2004 | .00 | 2,155.00 |
| 2005 | .00 | 2,191.00 |
| 2006 | .00 | 2,180.00 |
| 2007 | .00 | 2,240.00 |
| 2008 | .00 | 2,142.00 |
| 2009 | .00 | 2,188.00 |
| 2010 | .00 | 2,269.00 |
| 2011 | .00 | 2,259.00 |
| 2012 | .00 | 2,322.00 |
| 2013 | .00 | 2,328.00 |
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