|
| year | production | consumption |
| 1980 | 2,114.00 | 1,765.00 |
| 1981 | 2,012.00 | 1,705.00 |
| 1982 | 2,045.00 | 1,660.00 |
| 1983 | 2,120.00 | 1,730.00 |
| 1984 | 2,296.00 | 1,740.00 |
| 1985 | 2,505.00 | 1,885.00 |
| 1986 | 2,620.00 | 2,000.00 |
| 1987 | 2,690.00 | 2,120.04 |
| 1988 | 2,730.00 | 2,275.00 |
| 1989 | 2,756.50 | 2,379.52 |
| 1990 | 2,774.00 | 2,296.40 |
| 1991 | 2,835.00 | 2,498.80 |
| 1992 | 2,845.00 | 2,661.60 |
| 1993 | 2,890.00 | 2,959.49 |
| 1994 | 2,939.29 | 3,160.61 |
| 1995 | 2,990.00 | 3,363.16 |
| 1996 | 3,131.34 | 3,610.09 |
| 1997 | 3,200.34 | 3,916.27 |
| 1998 | 3,198.19 | 4,105.83 |
| 1999 | 3,195.00 | 4,363.60 |
| 2000 | 3,248.76 | 4,795.72 |
| 2001 | 3,300.00 | 4,917.88 |
| 2002 | 3,389.65 | 5,160.71 |
| 2003 | 3,408.87 | 5,578.11 |
| 2004 | 3,485.31 | 6,437.48 |
| 2005 | 3,608.62 | 6,695.44 |
| 2006 | 3,672.74 | 7,263.33 |
| 2007 | 3,728.82 | 7,534.08 |
| 2008 | 3,790.18 | 7,467.52 |
| 2009 | 3,795.96 | 8,539.73 |
| 2010 | 4,078.36 | 9,330.18 |
| 2011 | 4,058.69 | 8,924.00 |
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