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Loading...
| year | production | consumption |
| 1992 | .78 | .99 |
| 1993 | .72 | .84 |
| 1994 | .66 | .76 |
| 1995 | .65 | .73 |
| 1996 | .65 | .65 |
| 1997 | .62 | .64 |
| 1998 | .73 | .54 |
| 1999 | .84 | .56 |
| 2000 | .84 | .53 |
| 2001 | .88 | .61 |
| 2002 | .88 | .59 |
| 2003 | .91 | .60 |
| 2004 | .89 | .64 |
| 2005 | 1.18 | .66 |
| 2006 | 1.66 | .70 |
| 2007 | 2.24 | .59 |
| 2008 | 2.52 | .64 |
| 2009 | 2.79 | .58 |
| 2010 | 2.88 | .58 |
| 2011 | 2.75 | .56 |
| 2012 | 2.60 | .60 |
| 2013 | 2.51 | .60 |
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