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Loading...
| year | production | consumption |
| 1980 | .06 | .05 |
| 1981 | .07 | .06 |
| 1982 | .08 | .07 |
| 1983 | .09 | .08 |
| 1984 | .10 | .10 |
| 1985 | .10 | .10 |
| 1986 | .10 | .10 |
| 1987 | .20 | .10 |
| 1988 | .20 | .20 |
| 1989 | .20 | .20 |
| 1990 | .20 | .20 |
| 1991 | .20 | .20 |
| 1992 | .20 | .20 |
| 1993 | .20 | .20 |
| 1994 | .30 | .20 |
| 1995 | .30 | .30 |
| 1996 | .30 | .30 |
| 1997 | .30 | .30 |
| 1998 | .30 | .30 |
| 1999 | .30 | .30 |
| 2000 | .40 | .40 |
| 2001 | .40 | .40 |
| 2002 | .40 | .40 |
| 2003 | .50 | .40 |
| 2004 | .50 | .50 |
| 2005 | .40 | .40 |
| 2006 | .50 | .50 |
| 2007 | .50 | .50 |
| 2008 | .60 | .50 |
| 2009 | .60 | .60 |
| 2010 | .60 | .60 |
| 2011 | .60 | .60 |
| 2012 | .60 | .50 |
| 2013 | .60 | .60 |
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