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Loading...
| year | production | consumption |
| 1992 | .20 | .32 |
| 1993 | .21 | .32 |
| 1994 | .22 | .34 |
| 1995 | .21 | .35 |
| 1996 | .22 | .35 |
| 1997 | .19 | .35 |
| 1998 | .19 | .37 |
| 1999 | .19 | .38 |
| 2000 | .18 | .37 |
| 2001 | .19 | .38 |
| 2002 | .17 | .37 |
| 2003 | .17 | .39 |
| 2004 | .18 | .41 |
| 2005 | .17 | .41 |
| 2006 | .16 | .41 |
| 2007 | .16 | .40 |
| 2008 | .16 | .40 |
| 2009 | .18 | .39 |
| 2010 | .19 | .39 |
| 2011 | .13 | .35 |
| 2012 | .14 | .35 |
| 2013 | .17 | .40 |
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