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Loading...
| year | production | consumption |
| 1980 | .15 | .18 |
| 1981 | .04 | .07 |
| 1982 | .04 | .06 |
| 1983 | .05 | .09 |
| 1984 | .01 | .03 |
| 1985 | .00 | .03 |
| 1986 | .00 | .02 |
| 1987 | .00 | .02 |
| 1988 | .00 | .03 |
| 1989 | .00 | .02 |
| 1990 | .00 | .02 |
| 1991 | .00 | .02 |
| 1992 | .00 | .02 |
| 1993 | .01 | .02 |
| 1994 | .01 | .02 |
| 1995 | .01 | .02 |
| 1996 | .01 | .02 |
| 1997 | .01 | .03 |
| 1998 | .02 | .03 |
| 1999 | .08 | .08 |
| 2000 | .10 | .10 |
| 2001 | .12 | .13 |
| 2002 | .13 | .13 |
| 2003 | .11 | .13 |
| 2004 | .16 | .14 |
| 2005 | .21 | .16 |
| 2006 | .24 | .17 |
| 2007 | .25 | .18 |
| 2008 | .25 | .17 |
| 2009 | .26 | .18 |
| 2010 | .27 | .19 |
| 2011 | .32 | .21 |
| 2012 | .40 | .18 |
| 2013 | .35 | .19 |
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