|
| year | production | consumption |
| 1980 | 11,968.00 | 20,206.54 |
| 1981 | 12,170.00 | 19,231.81 |
| 1982 | 12,668.00 | 18,357.84 |
| 1983 | 12,733.00 | 18,035.12 |
| 1984 | 13,097.00 | 18,635.02 |
| 1985 | 13,187.00 | 18,724.26 |
| 1986 | 12,589.00 | 19,328.27 |
| 1987 | 12,432.14 | 19,840.75 |
| 1988 | 12,268.00 | 20,557.59 |
| 1989 | 11,692.76 | 20,790.27 |
| 1990 | 11,461.33 | 20,319.32 |
| 1991 | 11,644.32 | 20,128.03 |
| 1992 | 11,445.57 | 20,518.80 |
| 1993 | 11,199.11 | 20,799.54 |
| 1994 | 11,189.60 | 21,404.04 |
| 1995 | 11,076.28 | 21,332.17 |
| 1996 | 11,245.29 | 21,989.58 |
| 1997 | 11,477.94 | 22,455.89 |
| 1998 | 11,392.47 | 22,857.85 |
| 1999 | 10,786.33 | 23,586.04 |
| 2000 | 10,902.57 | 23,818.72 |
| 2001 | 11,048.56 | 23,768.44 |
| 2002 | 11,177.57 | 23,853.45 |
| 2003 | 11,408.47 | 24,248.20 |
| 2004 | 11,309.39 | 25,090.98 |
| 2005 | 10,977.74 | 25,242.81 |
| 2006 | 10,959.38 | 25,048.28 |
| 2007 | 10,848.02 | 25,145.82 |
| 2008 | 10,418.67 | 23,899.62 |
| 2009 | 10,578.20 | 23,004.24 |
| 2010 | 10,840.61 | 23,527.40 |
| 2011 | 11,152.37 | 23,371.46 |
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