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Loading...
| year | production | consumption |
| 1980 | .00 | .08 |
| 1981 | .00 | .09 |
| 1982 | .00 | .11 |
| 1983 | .00 | .11 |
| 1984 | .00 | .12 |
| 1985 | .00 | .12 |
| 1986 | .00 | .13 |
| 1987 | .00 | .14 |
| 1988 | .00 | .13 |
| 1989 | .00 | .14 |
| 1990 | .01 | .15 |
| 1991 | .01 | .14 |
| 1992 | .01 | .16 |
| 1993 | .01 | .16 |
| 1994 | .01 | .18 |
| 1995 | .01 | .19 |
| 1996 | .01 | .21 |
| 1997 | .01 | .20 |
| 1998 | .01 | .22 |
| 1999 | .01 | .21 |
| 2000 | .01 | .23 |
| 2001 | .01 | .22 |
| 2002 | .01 | .23 |
| 2003 | .01 | .25 |
| 2004 | .01 | .28 |
| 2005 | .01 | .29 |
| 2006 | .01 | .31 |
| 2007 | .01 | .31 |
| 2008 | .01 | .32 |
| 2009 | .01 | .31 |
| 2010 | .01 | .32 |
| 2011 | .01 | .31 |
| 2012 | .01 | .32 |
| 2013 | .01 | .27 |
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