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| year | production | consumption |
| 1992 | .70 | 1.30 |
| 1993 | .60 | 1.20 |
| 1996 | .20 | .60 |
| 1997 | .10 | .50 |
| 1998 | .30 | .80 |
| 1999 | .20 | 1.00 |
| 2000 | .30 | .90 |
| 2001 | .40 | .70 |
| 2002 | .30 | 1.00 |
| 2003 | .70 | 1.20 |
| 2004 | .70 | 1.30 |
| 2005 | .80 | 1.50 |
| 2006 | 1.00 | 1.70 |
| 2007 | .80 | 2.00 |
| 2008 | .90 | 2.10 |
| 2009 | .90 | 2.00 |
| 2010 | .80 | 2.00 |
| 2011 | .70 | 1.80 |
| 2012 | .30 | 1.70 |
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