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Loading...
| year | production | consumption |
| 1980 | .08 | .38 |
| 1981 | .08 | .36 |
| 1982 | .01 | .38 |
| 1983 | .00 | .37 |
| 1984 | .00 | .35 |
| 1985 | .00 | .37 |
| 1986 | .00 | .39 |
| 1987 | .00 | .43 |
| 1988 | .00 | .45 |
| 1989 | .00 | .47 |
| 1990 | .00 | .48 |
| 1991 | .00 | .49 |
| 1992 | .00 | .50 |
| 1993 | .00 | .61 |
| 1994 | .00 | .64 |
| 1995 | .00 | .66 |
| 1996 | .00 | .68 |
| 1997 | .00 | .70 |
| 1998 | .00 | .72 |
| 1999 | .00 | .72 |
| 2000 | .00 | .81 |
| 2001 | .00 | .78 |
| 2002 | .00 | .85 |
| 2003 | .00 | .86 |
| 2004 | .03 | .88 |
| 2005 | .03 | .81 |
| 2006 | .04 | .88 |
| 2007 | .04 | .90 |
| 2008 | .05 | .89 |
| 2009 | .04 | .86 |
| 2010 | .06 | .96 |
| 2011 | .10 | .92 |
| 2012 | .06 | .96 |
| 2013 | .17 | .93 |
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