|
| year | production | consumption |
| 1980 | | |
| 1981 | | |
| 1982 | | |
| 1983 | | |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 7,631.93 | 4,423.16 |
| 1993 | 6,730.00 | 3,750.46 |
| 1994 | 6,135.00 | 3,178.98 |
| 1995 | 5,995.00 | 2,976.13 |
| 1996 | 5,850.00 | 2,619.46 |
| 1997 | 5,920.00 | 2,562.48 |
| 1998 | 5,854.00 | 2,488.61 |
| 1999 | 6,078.95 | 2,537.62 |
| 2000 | 6,479.20 | 2,578.50 |
| 2001 | 6,917.00 | 2,590.23 |
| 2002 | 7,408.17 | 2,636.41 |
| 2003 | 8,132.20 | 2,681.86 |
| 2004 | 8,804.71 | 2,750.81 |
| 2005 | 9,043.08 | 2,785.14 |
| 2006 | 9,247.21 | 2,803.47 |
| 2007 | 9,437.06 | 2,697.39 |
| 2008 | 9,356.78 | 2,906.04 |
| 2009 | 9,495.37 | 2,950.43 |
| 2010 | 9,694.11 | 2,992.09 |
| 2011 | 9,773.52 | 2,725.00 |
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