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Loading...
| year | production | consumption |
| 1992 | .15 | .48 |
| 1993 | .14 | .39 |
| 1994 | .09 | .36 |
| 1995 | .12 | .38 |
| 1996 | .15 | .36 |
| 1997 | .13 | .36 |
| 1998 | .15 | .39 |
| 1999 | .11 | .30 |
| 2000 | .10 | .30 |
| 2001 | .14 | .32 |
| 2002 | .17 | .34 |
| 2003 | .18 | .35 |
| 2004 | .17 | .35 |
| 2005 | .12 | .35 |
| 2006 | .10 | .35 |
| 2007 | .11 | .38 |
| 2008 | .11 | .38 |
| 2009 | .12 | .32 |
| 2010 | .01 | .26 |
| 2011 | .01 | .27 |
| 2012 | .02 | .27 |
| 2013 | .02 | .31 |
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