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Loading...
| year | production | consumption |
| 1980 | .02 | .02 |
| 1981 | .02 | .02 |
| 1982 | .02 | .03 |
| 1983 | .02 | .02 |
| 1984 | .02 | .03 |
| 1985 | .01 | .03 |
| 1986 | .30 | .04 |
| 1987 | 1.20 | .04 |
| 1988 | 1.50 | .04 |
| 1989 | 1.50 | .04 |
| 1990 | 1.50 | .05 |
| 1991 | 1.60 | .06 |
| 1992 | 1.60 | .05 |
| 1993 | 1.60 | .08 |
| 1994 | 1.70 | .09 |
| 1995 | 1.70 | .10 |
| 1996 | 1.90 | .20 |
| 1997 | 1.80 | .40 |
| 1998 | 1.80 | .30 |
| 1999 | 1.80 | .30 |
| 2000 | 1.80 | .30 |
| 2001 | 1.90 | .40 |
| 2002 | 2.20 | .50 |
| 2003 | 2.50 | .60 |
| 2004 | 2.30 | .60 |
| 2005 | 2.60 | .60 |
| 2006 | 4.50 | .70 |
| 2007 | 6.50 | .90 |
| 2008 | 6.90 | 1.10 |
| 2009 | 6.90 | 1.40 |
| 2010 | 7.30 | 1.80 |
| 2011 | 7.00 | 1.60 |
| 2012 | 6.70 | 1.70 |
| 2013 | 7.50 | 2.00 |
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