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Loading...
| year | production | consumption |
| 1980 | .02 | .46 |
| 1981 | .03 | .46 |
| 1982 | .04 | .50 |
| 1983 | .04 | .46 |
| 1984 | .05 | .47 |
| 1985 | .05 | .48 |
| 1986 | .06 | .50 |
| 1987 | .06 | .49 |
| 1988 | .05 | .50 |
| 1989 | .05 | .50 |
| 1990 | .05 | .50 |
| 1991 | .05 | .46 |
| 1992 | .06 | .41 |
| 1993 | .06 | .40 |
| 1994 | .07 | .41 |
| 1995 | .07 | .42 |
| 1996 | .09 | .43 |
| 1997 | .11 | .47 |
| 1998 | .10 | .45 |
| 1999 | .12 | .46 |
| 2000 | .13 | .46 |
| 2001 | .14 | .47 |
| 2002 | .13 | .47 |
| 2003 | .15 | .46 |
| 2004 | .16 | .52 |
| 2005 | .14 | .45 |
| 2006 | .14 | .36 |
| 2007 | .15 | .37 |
| 2008 | .17 | .35 |
| 2009 | .16 | .42 |
| 2010 | .17 | .40 |
| 2011 | .17 | .41 |
| 2012 | .17 | .41 |
| 2013 | .16 | .40 |
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