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Loading...
| year | production | consumption |
| 1980 | .01 | .86 |
| 1981 | .03 | .75 |
| 1982 | .07 | .74 |
| 1983 | .10 | .69 |
| 1984 | .11 | .71 |
| 1985 | .17 | .81 |
| 1986 | .24 | .82 |
| 1987 | .31 | .83 |
| 1988 | .31 | .81 |
| 1989 | .37 | .75 |
| 1990 | .38 | .77 |
| 1991 | .46 | .84 |
| 1992 | .51 | .79 |
| 1993 | .56 | .84 |
| 1994 | .60 | .87 |
| 1995 | .62 | .88 |
| 1996 | .71 | .98 |
| 1997 | .82 | .94 |
| 1998 | .84 | .92 |
| 1999 | .98 | .89 |
| 2000 | 1.15 | .88 |
| 2001 | 1.12 | .89 |
| 2002 | 1.18 | .86 |
| 2003 | 1.18 | .90 |
| 2004 | 1.29 | .86 |
| 2005 | 1.30 | .85 |
| 2006 | 1.22 | .90 |
| 2007 | 1.12 | .88 |
| 2008 | 1.09 | .83 |
| 2009 | .97 | .79 |
| 2010 | .95 | .82 |
| 2011 | .86 | .78 |
| 2012 | .79 | .73 |
| 2013 | .71 | .75 |
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