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Loading...
| year | production | consumption |
| 1980 | .00 | .10 |
| 1981 | .00 | .10 |
| 1982 | .00 | .12 |
| 1983 | .00 | .10 |
| 1984 | .00 | .13 |
| 1985 | .00 | .15 |
| 1986 | .02 | .14 |
| 1987 | .04 | .14 |
| 1988 | .36 | .14 |
| 1989 | .41 | .15 |
| 1990 | .40 | .16 |
| 1991 | .41 | .17 |
| 1992 | .38 | .17 |
| 1993 | .46 | .14 |
| 1994 | .70 | .14 |
| 1995 | .72 | .15 |
| 1996 | .71 | .15 |
| 1997 | .76 | .16 |
| 1998 | .81 | .17 |
| 1999 | .86 | .18 |
| 2000 | .92 | .19 |
| 2001 | .92 | .21 |
| 2002 | .92 | .23 |
| 2003 | .90 | .24 |
| 2004 | .85 | .25 |
| 2005 | .84 | .26 |
| 2006 | .78 | .28 |
| 2007 | .67 | .26 |
| 2008 | .63 | .31 |
| 2009 | .63 | .29 |
| 2010 | .83 | .36 |
| 2011 | .82 | .31 |
| 2012 | .65 | .29 |
| 2013 | .67 | .33 |
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