|
| year | production | consumption |
| 1984 | 1,163.66 | 1,345.02 |
| 1985 | 960.62 | 1,163.16 |
| 1986 | 3,428.16 | 3,436.07 |
| 1987 | 3,391.85 | 3,481.63 |
| 1988 | 3,655.98 | 3,704.26 |
| 1989 | 3,885.92 | 3,887.73 |
| 1990 | 4,083.91 | 3,970.31 |
| 1991 | 3,905.70 | 4,055.17 |
| 1992 | 4,569.09 | 4,362.23 |
| 1993 | 4,673.86 | 4,520.04 |
| 1994 | 4,684.40 | 4,651.47 |
| 1995 | 4,634.44 | 4,646.46 |
| 1996 | 4,577.14 | 4,443.12 |
| 1997 | 4,769.71 | 4,798.50 |
| 1998 | 4,642.81 | 4,758.50 |
| 1999 | 4,539.50 | 4,771.60 |
| 2000 | 4,521.85 | 4,528.59 |
| 2001 | 4,256.25 | 4,462.30 |
| 2002 | 4,276.30 | 4,582.32 |
| 2003 | 4,495.81 | 4,693.05 |
| 2004 | 4,432.04 | 4,683.21 |
| 2005 | 4,544.57 | 4,800.81 |
| 2006 | 4,473.69 | 4,901.50 |
| 2007 | 4,202.44 | 4,899.58 |
| 2008 | 3,915.62 | 4,746.44 |
| 2009 | 3,768.92 | 4,726.04 |
| 2010 | 3,881.20 | 4,824.18 |
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