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| year | production | consumption |
| 1992 | 4.17 | 8.69 |
| 1993 | 3.81 | 8.38 |
| 1994 | 3.34 | 7.13 |
| 1995 | 3.41 | 7.01 |
| 1996 | 3.05 | 6.35 |
| 1997 | 3.02 | 6.06 |
| 1998 | 3.04 | 5.86 |
| 1999 | 3.05 | 5.76 |
| 2000 | 3.05 | 5.77 |
| 2001 | 3.06 | 5.66 |
| 2002 | 3.06 | 5.82 |
| 2003 | 3.20 | 6.31 |
| 2004 | 3.21 | 6.27 |
| 2005 | 3.23 | 6.24 |
| 2006 | 3.28 | 5.72 |
| 2007 | 3.21 | 6.13 |
| 2008 | 3.31 | 6.21 |
| 2009 | 3.14 | 4.60 |
| 2010 | 3.13 | 5.14 |
| 2011 | 3.39 | 5.69 |
| 2012 | 3.38 | 5.25 |
| 2013 | 2.89 | 5.01 |
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