|
| year | production | consumption |
| 1984 | 5,002.26 | 5,794.02 |
| 1985 | 4,588.35 | 5,132.28 |
| 1986 | 12,924.19 | 12,415.74 |
| 1987 | 12,743.88 | 12,259.83 |
| 1988 | 12,876.97 | 12,367.17 |
| 1989 | 13,380.47 | 12,584.71 |
| 1990 | 13,502.65 | 12,481.13 |
| 1991 | 13,331.39 | 12,583.28 |
| 1992 | 12,934.68 | 11,755.17 |
| 1993 | 12,409.28 | 11,361.36 |
| 1994 | 12,200.81 | 11,243.97 |
| 1995 | 11,903.81 | 11,207.39 |
| 1996 | 11,812.15 | 10,764.67 |
| 1997 | 11,995.43 | 11,087.92 |
| 1998 | 11,842.99 | 11,193.69 |
| 1999 | 11,390.71 | 10,850.62 |
| 2000 | 11,326.92 | 10,452.82 |
| 2001 | 11,350.61 | 10,332.35 |
| 2002 | 11,163.70 | 10,285.14 |
| 2003 | 11,261.57 | 10,159.38 |
| 2004 | 11,285.30 | 10,098.81 |
| 2005 | 11,499.74 | 10,424.54 |
| 2006 | 11,344.08 | 10,013.55 |
| 2007 | 10,763.36 | 9,742.59 |
| 2008 | 10,332.89 | 9,296.84 |
| 2009 | 10,109.02 | 8,950.14 |
| 2010 | 9,804.53 | 8,897.08 |
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