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Loading...
| year | production | consumption |
| 1987 | .60 | .60 |
| 1988 | .70 | .70 |
| 1989 | .50 | 1.00 |
| 1990 | .60 | 1.20 |
| 1991 | .40 | 1.00 |
| 1992 | .50 | 1.50 |
| 1993 | .60 | 1.80 |
| 1994 | .50 | 2.10 |
| 1995 | .50 | 2.60 |
| 1996 | .60 | 2.70 |
| 1997 | .50 | 3.60 |
| 1998 | 2.00 | 5.20 |
| 1999 | 1.80 | 5.80 |
| 2000 | .60 | 4.80 |
| 2001 | .50 | 4.70 |
| 2002 | .60 | 4.70 |
| 2003 | .50 | 5.00 |
| 2004 | .50 | 5.20 |
| 2005 | .60 | 5.00 |
| 2006 | .50 | 5.60 |
| 2007 | .50 | 5.70 |
| 2008 | .50 | 5.50 |
| 2009 | .80 | 5.40 |
| 2010 | .80 | 5.90 |
| 2011 | .80 | 6.30 |
| 2012 | .60 | 7.10 |
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