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| year | production | consumption |
| 1980 | 10.00 | 4,960.00 |
| 1981 | 7.00 | 4,848.00 |
| 1982 | 9.00 | 4,582.00 |
| 1983 | 9.00 | 4,395.00 |
| 1984 | 8.00 | 4,666.00 |
| 1985 | 11.00 | 4,436.00 |
| 1986 | 13.00 | 4,503.00 |
| 1987 | 12.00 | 4,567.00 |
| 1988 | 12.00 | 4,849.00 |
| 1989 | 11.00 | 5,058.00 |
| 1990 | 11.00 | 5,293.00 |
| 1991 | 15.00 | 5,357.00 |
| 1992 | 17.00 | 5,446.00 |
| 1993 | 12.00 | 5,364.00 |
| 1994 | 11.00 | 5,622.00 |
| 1995 | 11.00 | 5,659.00 |
| 1996 | 12.00 | 5,704.00 |
| 1997 | 9.90 | 5,667.00 |
| 1998 | 9.00 | 5,472.00 |
| 1999 | 7.90 | 5,606.00 |
| 2000 | 7.00 | 5,480.00 |
| 2001 | 6.30 | 5,380.00 |
| 2002 | 5.30 | 5,287.00 |
| 2003 | 5.00 | 5,397.00 |
| 2004 | 6.00 | 5,288.00 |
| 2005 | 6.60 | 5,298.00 |
| 2006 | 6.00 | 5,168.00 |
| 2007 | 5.70 | 5,009.00 |
| 2008 | 6.00 | 4,770.00 |
| 2009 | 5.30 | 4,363.00 |
| 2010 | 5.00 | 4,429.00 |
| 2011 | 5.00 | 4,439.00 |
| 2012 | 5.00 | 4,697.00 |
| 2013 | 4.70 | 4,557.00 |
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