|
| year | production | consumption |
| 1980 | 8,597.00 | 17,056.00 |
| 1981 | 8,572.00 | 16,058.00 |
| 1982 | 8,649.00 | 15,296.00 |
| 1983 | 8,688.00 | 15,231.00 |
| 1984 | 8,879.00 | 15,725.61 |
| 1985 | 8,971.00 | 15,726.42 |
| 1986 | 8,680.00 | 16,280.63 |
| 1987 | 8,349.14 | 16,665.04 |
| 1988 | 8,140.00 | 17,283.31 |
| 1989 | 7,613.00 | 17,325.15 |
| 1990 | 7,355.31 | 16,988.50 |
| 1991 | 7,416.55 | 16,713.84 |
| 1992 | 7,171.12 | 17,032.86 |
| 1993 | 6,846.67 | 17,236.73 |
| 1994 | 6,661.58 | 17,718.16 |
| 1995 | 6,559.64 | 17,724.59 |
| 1996 | 6,464.52 | 18,308.90 |
| 1997 | 6,451.59 | 18,620.30 |
| 1998 | 6,251.83 | 18,917.14 |
| 1999 | 5,881.46 | 19,519.34 |
| 2000 | 5,821.60 | 19,701.08 |
| 2001 | 5,801.40 | 19,648.71 |
| 2002 | 5,744.08 | 19,761.30 |
| 2003 | 5,644.07 | 20,033.51 |
| 2004 | 5,435.14 | 20,731.15 |
| 2005 | 5,185.74 | 20,802.16 |
| 2006 | 5,088.55 | 20,687.42 |
| 2007 | 5,076.95 | 20,680.38 |
| 2008 | 5,000.37 | 19,497.97 |
| 2009 | 5,352.88 | 18,771.40 |
| 2010 | 5,478.72 | 19,180.13 |
| 2011 | 5,651.88 | 18,949.43 |
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