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Loading...
| year | production | consumption |
| 1992 | .18 | .30 |
| 1993 | .18 | .26 |
| 1994 | .18 | .25 |
| 1995 | .15 | .21 |
| 1996 | .15 | .23 |
| 1997 | .14 | .22 |
| 1998 | .15 | .23 |
| 1999 | .16 | .24 |
| 2000 | .14 | .24 |
| 2001 | .15 | .25 |
| 2002 | .16 | .25 |
| 2003 | .17 | .27 |
| 2004 | .17 | .27 |
| 2005 | .17 | .28 |
| 2006 | .17 | .28 |
| 2007 | .17 | .27 |
| 2008 | .17 | .21 |
| 2009 | .16 | .19 |
| 2010 | .16 | .19 |
| 2011 | .16 | .19 |
| 2012 | .17 | .20 |
| 2013 | .17 | .21 |
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