|
| year | production | consumption |
| 1980 | 8,838.33 | 20,031.20 |
| 1981 | 13,971.80 | 24,571.62 |
| 1982 | 14,099.67 | 24,386.43 |
| 1983 | 12,462.73 | 19,876.88 |
| 1984 | 13,134.04 | 22,667.93 |
| 1985 | 13,005.07 | 22,385.74 |
| 1986 | 11,294.28 | 19,535.16 |
| 1987 | 8,501.03 | 18,345.77 |
| 1988 | 4,590.02 | 15,013.48 |
| 1989 | 4,716.79 | 18,145.15 |
| 1990 | 2,692.95 | 18,033.81 |
| 1991 | 2,322.57 | 17,035.67 |
| 1992 | 1,319.47 | 15,458.81 |
| 1993 | 1,070.34 | 14,080.93 |
| 1994 | 830.04 | 15,081.82 |
| 1995 | 702.17 | 14,416.03 |
| 1996 | 617.29 | 13,932.11 |
| 1997 | 470.69 | 13,530.87 |
| 1998 | 343.92 | 13,599.21 |
| 1999 | 401.24 | 11,901.66 |
| 2000 | 413.37 | 13,326.94 |
| 2001 | 240.30 | 12,249.99 |
| 2002 | 190.70 | 10,587.70 |
| 2003 | 142.20 | 9,881.12 |
| 2004 | 199.52 | 9,638.61 |
| 2005 | 120.15 | 8,655.35 |
| 2006 | 30.86 | 8,201.20 |
| 2007 | | 7,330.37 |
| 2008 | | 7,490.21 |
| 2009 | | 5,176.45 |
| 2010 | | 5,488.41 |
| 2011 | | 4,443.42 |
|
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