|
| year | production | consumption |
| 1980 | 66.14 | 1,177.27 |
| 1981 | 76.06 | 1,431.90 |
| 1982 | 68.34 | 1,451.74 |
| 1983 | 82.67 | 1,715.20 |
| 1984 | 77.16 | 1,652.37 |
| 1985 | 62.83 | 1,774.72 |
| 1986 | 59.52 | 2,554.06 |
| 1987 | 49.60 | 3,597.94 |
| 1988 | 46.30 | 3,625.50 |
| 1989 | 47.40 | 3,645.34 |
| 1990 | 27.56 | 3,600.15 |
| 1991 | 1.10 | 3,580.31 |
| 1992 | 1.10 | 3,284.89 |
| 1993 | 1.10 | 3,247.41 |
| 1994 | .05 | 3,039.12 |
| 1995 | 1.10 | 3,020.33 |
| 1996 | 31.97 | 3,365.36 |
| 1997 | 34.17 | 3,142.69 |
| 1998 | 33.07 | 3,266.15 |
| 1999 | 34.17 | 2,807.59 |
| 2000 | 51.81 | 3,330.08 |
| 2001 | 51.81 | 3,408.35 |
| 2002 | 60.63 | 3,176.86 |
| 2003 | 56.22 | 3,187.89 |
| 2004 | 60.63 | 3,269.46 |
| 2005 | 60.63 | 3,359.85 |
| 2006 | 61.73 | 3,002.70 |
| 2007 | 59.52 | 2,773.42 |
| 2008 | 65.04 | 2,625.71 |
| 2009 | 78.26 | 2,183.68 |
| 2010 | 72.75 | 2,179.27 |
| 2011 | 67.24 | 2,350.13 |
|
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