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| year | production | consumption |
| 1980 | 2,837.00 | 6,586.00 |
| 1981 | 2,696.00 | 6,079.00 |
| 1982 | 2,627.00 | 7,204.00 |
| 1983 | 2,465.00 | 9,824.00 |
| 1984 | 2,217.00 | 11,557.00 |
| 1985 | 2,048.00 | 12,219.00 |
| 1986 | 1,902.00 | 14,952.00 |
| 1987 | 1,653.00 | 16,374.00 |
| 1988 | 1,351.00 | 18,707.00 |
| 1989 | 865.00 | 19,315.00 |
| 1990 | 520.00 | 18,993.00 |
| 1991 | 444.00 | 20,696.00 |
| 1992 | 369.00 | 24,340.00 |
| 1993 | 362.00 | 27,161.00 |
| 1994 | 314.00 | 28,161.00 |
| 1995 | 259.00 | 29,314.00 |
| 1996 | 163.00 | 33,425.00 |
| 1997 | 109.00 | 37,884.00 |
| 1998 | 87.00 | 42,261.00 |
| 1999 | 101.00 | 44,345.00 |
| 2000 | 92.00 | 52,924.00 |
| 2001 | .00 | 55,229.00 |
| 2002 | .00 | 60,292.00 |
| 2003 | .00 | 63,215.00 |
| 2004 | .00 | 64,607.00 |
| 2005 | .00 | 65,425.00 |
| 2006 | .00 | 68,181.00 |
| 2007 | .00 | 71,413.00 |
| 2008 | .00 | 68,793.00 |
| 2009 | .00 | 65,748.00 |
| 2010 | .00 | 70,593.00 |
| 2011 | .00 | 75,190.00 |
| 2012 | .00 | 73,125.00 |
| 2013 | .00 | 74,740.00 |
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