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| year | production | consumption |
| 1993 | 1.20 | 1.61 |
| 1994 | 1.12 | 1.54 |
| 1995 | 1.06 | 1.58 |
| 1996 | 1.11 | 1.67 |
| 1997 | .90 | 1.47 |
| 1998 | .84 | 1.42 |
| 1999 | .76 | 1.33 |
| 2000 | .81 | 1.39 |
| 2001 | .84 | 1.44 |
| 2002 | .87 | 1.43 |
| 2003 | .92 | 1.50 |
| 2004 | .91 | 1.52 |
| 2005 | .90 | 1.54 |
| 2006 | .92 | 1.59 |
| 2007 | 1.07 | 1.64 |
| 2008 | 1.05 | 1.63 |
| 2009 | 1.00 | 1.53 |
| 2010 | 1.02 | 1.59 |
| 2011 | 1.06 | 1.76 |
| 2012 | 1.06 | 1.74 |
| 2013 | 1.00 | 1.71 |
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