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Loading...
| year | production | consumption |
| 1980 | .04 | .33 |
| 1981 | .06 | .31 |
| 1982 | .08 | .31 |
| 1983 | .09 | .31 |
| 1984 | .09 | .31 |
| 1985 | .10 | .31 |
| 1986 | .07 | .34 |
| 1987 | .07 | .34 |
| 1988 | .08 | .33 |
| 1989 | .09 | .35 |
| 1990 | .09 | .36 |
| 1991 | .09 | .38 |
| 1992 | .09 | .39 |
| 1993 | .10 | .40 |
| 1994 | .11 | .42 |
| 1995 | .11 | .43 |
| 1996 | .10 | .46 |
| 1997 | .09 | .49 |
| 1998 | .07 | .53 |
| 1999 | .06 | .57 |
| 2000 | .06 | .60 |
| 2001 | .04 | .63 |
| 2002 | .04 | .62 |
| 2003 | .04 | .62 |
| 2004 | .04 | .64 |
| 2005 | .04 | .66 |
| 2006 | .04 | .70 |
| 2007 | .04 | .69 |
| 2008 | .05 | .69 |
| 2009 | .05 | .62 |
| 2010 | .05 | .63 |
| 2011 | .06 | .59 |
| 2012 | .06 | .57 |
| 2013 | .06 | .58 |
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