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Loading...
| year | production | consumption |
| 1980 | .04 | .22 |
| 1981 | .04 | .22 |
| 1982 | .03 | .21 |
| 1983 | .03 | .22 |
| 1984 | .03 | .21 |
| 1985 | .03 | .23 |
| 1986 | .03 | .25 |
| 1987 | .03 | .25 |
| 1988 | .03 | .26 |
| 1989 | .03 | .29 |
| 1990 | .03 | .31 |
| 1991 | .03 | .31 |
| 1992 | .03 | .32 |
| 1993 | .02 | .34 |
| 1994 | .03 | .38 |
| 1995 | .03 | .37 |
| 1996 | .04 | .39 |
| 1997 | .03 | .41 |
| 1998 | .02 | .40 |
| 1999 | .01 | .43 |
| 2000 | .01 | .45 |
| 2001 | .01 | .48 |
| 2002 | .01 | .49 |
| 2003 | .02 | .49 |
| 2004 | .02 | .49 |
| 2005 | .02 | .51 |
| 2006 | .02 | .54 |
| 2007 | .01 | .55 |
| 2008 | .02 | .63 |
| 2009 | .03 | .65 |
| 2010 | .04 | .73 |
| 2011 | .03 | .76 |
| 2012 | .03 | .79 |
| 2013 | .04 | .64 |
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