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Loading...
| year | production | consumption |
| 1986 | .20 | .20 |
| 1987 | .20 | .20 |
| 1988 | .20 | .20 |
| 1989 | .20 | .20 |
| 1990 | .10 | .20 |
| 1991 | .20 | .20 |
| 1992 | .30 | .30 |
| 1993 | .60 | .60 |
| 1994 | .60 | .60 |
| 1995 | .60 | .60 |
| 1996 | .70 | .50 |
| 1997 | .60 | .50 |
| 1998 | .20 | 2.20 |
| 1999 | .20 | 2.30 |
| 2000 | .30 | 1.30 |
| 2001 | .30 | 1.40 |
| 2002 | .80 | 1.70 |
| 2003 | .90 | 1.40 |
| 2004 | 2.10 | 2.20 |
| 2005 | 2.10 | 2.40 |
| 2006 | 1.20 | 3.00 |
| 2007 | 2.10 | 3.30 |
| 2008 | 1.70 | 3.90 |
| 2009 | .50 | 5.30 |
| 2010 | 1.00 | 5.80 |
| 2011 | 1.50 | 7.10 |
| 2012 | .90 | 8.60 |
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