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Loading...
| year | production | consumption |
| 1980 | .00 | .27 |
| 1981 | .00 | .28 |
| 1982 | .00 | .32 |
| 1983 | .00 | .35 |
| 1984 | .00 | .36 |
| 1985 | .00 | .38 |
| 1986 | .00 | .40 |
| 1987 | .00 | .44 |
| 1988 | .00 | .50 |
| 1989 | .00 | .52 |
| 1990 | .00 | .47 |
| 1991 | .00 | .50 |
| 1992 | .00 | .52 |
| 1993 | .00 | .58 |
| 1994 | .00 | .56 |
| 1995 | .00 | .61 |
| 1996 | .00 | .63 |
| 1997 | .00 | .66 |
| 1998 | .00 | .71 |
| 1999 | .00 | .87 |
| 2000 | .00 | .79 |
| 2001 | .00 | .86 |
| 2002 | .00 | .93 |
| 2003 | .00 | .96 |
| 2004 | .00 | 1.07 |
| 2005 | .00 | 1.11 |
| 2006 | .00 | 1.10 |
| 2007 | .00 | 1.18 |
| 2008 | .00 | 1.11 |
| 2009 | .00 | 1.28 |
| 2010 | .00 | 1.37 |
| 2011 | .00 | 1.27 |
| 2012 | .00 | 1.20 |
| 2013 | .00 | 1.22 |
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