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Loading...
| year | production | consumption |
| 1980 | .14 | .01 |
| 1981 | .18 | .01 |
| 1982 | .19 | .01 |
| 1983 | .19 | .01 |
| 1984 | .26 | .01 |
| 1985 | .26 | .02 |
| 1986 | .25 | .02 |
| 1987 | .26 | .02 |
| 1988 | .31 | .02 |
| 1989 | .35 | .02 |
| 1990 | .35 | .02 |
| 1991 | .33 | .02 |
| 1992 | .37 | .02 |
| 1993 | .39 | .02 |
| 1994 | .38 | .02 |
| 1995 | .40 | .02 |
| 1996 | .43 | .02 |
| 1997 | .56 | .02 |
| 1998 | .58 | .01 |
| 1999 | .59 | .01 |
| 2000 | .62 | .01 |
| 2001 | .56 | .02 |
| 2002 | .55 | .02 |
| 2003 | .54 | .02 |
| 2004 | .52 | .02 |
| 2005 | .50 | .03 |
| 2006 | .53 | .03 |
| 2007 | .46 | .03 |
| 2008 | .52 | .04 |
| 2009 | .60 | .05 |
| 2010 | .69 | .07 |
| 2011 | .68 | .08 |
| 2012 | .66 | .08 |
| 2013 | .64 | .10 |
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