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Loading...
| year | production | consumption |
| 1980 | .01 | .10 |
| 1981 | .01 | .10 |
| 1982 | .01 | .20 |
| 1983 | .01 | .20 |
| 1984 | .01 | .10 |
| 1985 | .01 | .10 |
| 1986 | .01 | .10 |
| 1987 | .01 | .10 |
| 1988 | .01 | .10 |
| 1989 | .01 | .20 |
| 1990 | .02 | .20 |
| 1991 | .02 | .20 |
| 1992 | .02 | .20 |
| 1993 | .02 | .20 |
| 1994 | .05 | .30 |
| 1995 | .03 | .20 |
| 1996 | .05 | .30 |
| 1997 | .05 | .30 |
| 1998 | .06 | .30 |
| 1999 | .07 | .30 |
| 2000 | .08 | .40 |
| 2001 | .06 | .40 |
| 2002 | .06 | .40 |
| 2003 | .08 | .50 |
| 2004 | .08 | .50 |
| 2005 | .10 | .60 |
| 2006 | .10 | .60 |
| 2007 | .20 | .70 |
| 2008 | .20 | .70 |
| 2009 | .10 | .80 |
| 2010 | .10 | .90 |
| 2011 | .10 | .90 |
| 2012 | .20 | .90 |
| 2013 | .20 | 1.00 |
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