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Loading...
| year | production | consumption |
| 1980 | .55 | .17 |
| 1981 | .61 | .17 |
| 1982 | .50 | .17 |
| 1983 | .49 | .19 |
| 1984 | .58 | .25 |
| 1985 | .61 | .27 |
| 1986 | .53 | .21 |
| 1987 | .50 | .19 |
| 1988 | .51 | .20 |
| 1989 | .51 | .21 |
| 1990 | .52 | .23 |
| 1991 | .55 | .25 |
| 1992 | .51 | .25 |
| 1993 | .54 | .27 |
| 1994 | .56 | .31 |
| 1995 | .58 | .33 |
| 1996 | .62 | .36 |
| 1997 | .63 | .39 |
| 1998 | .63 | .39 |
| 1999 | .73 | .40 |
| 2000 | .82 | .42 |
| 2001 | .84 | .47 |
| 2002 | .94 | .50 |
| 2003 | 1.25 | .54 |
| 2004 | 1.35 | .59 |
| 2005 | 1.48 | .67 |
| 2006 | 1.71 | .82 |
| 2007 | 1.76 | .82 |
| 2008 | 1.76 | .90 |
| 2009 | 1.81 | .85 |
| 2010 | 1.86 | .94 |
| 2011 | 1.77 | .93 |
| 2012 | 1.81 | .83 |
| 2013 | 1.81 | .84 |
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