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| year | production | consumption |
| 1992 | 2.34 | .31 |
| 1993 | 2.58 | .28 |
| 1994 | 1.49 | .27 |
| 1995 | 1.36 | .30 |
| 1996 | 1.55 | .30 |
| 1997 | 1.16 | .31 |
| 1998 | .75 | .29 |
| 1999 | 1.15 | .32 |
| 2000 | 2.05 | .40 |
| 2001 | 2.13 | .50 |
| 2002 | 2.38 | .59 |
| 2003 | 2.61 | .76 |
| 2004 | 2.62 | .81 |
| 2005 | 2.66 | .83 |
| 2006 | 2.63 | .84 |
| 2007 | 2.84 | .90 |
| 2008 | 2.91 | .97 |
| 2009 | 1.77 | .89 |
| 2010 | 2.04 | .99 |
| 2011 | 2.83 | .98 |
| 2012 | 3.06 | 1.13 |
| 2013 | 3.44 | 1.15 |
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