|
| year | production | consumption |
| 1980 | 2,708.89 | 2,530.32 |
| 1981 | 2,786.53 | 2,540.71 |
| 1982 | 2,770.53 | 2,488.34 |
| 1983 | 3,050.68 | 2,713.37 |
| 1984 | 3,101.52 | 2,665.00 |
| 1985 | 3,002.71 | 2,504.46 |
| 1986 | 3,044.53 | 2,400.78 |
| 1987 | 2,645.54 | 2,183.67 |
| 1988 | 2,826.41 | 2,720.58 |
| 1989 | 3,090.90 | 2,300.54 |
| 1990 | 2,848.65 | 2,384.58 |
| 1991 | 2,958.77 | 2,321.63 |
| 1992 | 3,289.31 | 1,990.79 |
| 1993 | 3,407.00 | 2,553.81 |
| 1994 | 3,343.53 | 2,620.41 |
| 1995 | 3,797.51 | 2,215.69 |
| 1996 | 3,868.38 | 1,840.13 |
| 1997 | 4,038.91 | 2,580.55 |
| 1998 | 3,641.91 | 2,564.95 |
| 1999 | 3,864.41 | 2,729.03 |
| 2000 | 3,952.49 | 2,490.82 |
| 2001 | 4,311.58 | 2,920.46 |
| 2002 | 4,915.14 | 2,371.00 |
| 2003 | 5,709.88 | 3,991.37 |
| 2004 | 5,682.85 | 4,436.14 |
| 2005 | 5,806.05 | 4,733.50 |
| 2006 | 6,358.03 | 4,373.87 |
| 2007 | 5,330.13 | 3,665.64 |
| 2008 | 5,411.71 | 4,431.76 |
| 2009 | 5,030.21 | 3,296.28 |
| 2010 | 5,875.87 | 2,918.37 |
| 2011 | 5,453.13 | 3,248.51 |
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