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| year | production | consumption |
| 1991 | 6.36 | 14.31 |
| 1992 | 6.18 | 14.05 |
| 1993 | 5.85 | 14.06 |
| 1994 | 5.72 | 14.04 |
| 1995 | 5.67 | 14.31 |
| 1996 | 5.50 | 14.30 |
| 1997 | 5.57 | 14.22 |
| 1998 | 5.27 | 14.22 |
| 1999 | 5.32 | 14.02 |
| 2000 | 5.33 | 14.18 |
| 2001 | 5.30 | 14.54 |
| 2002 | 5.31 | 14.20 |
| 2003 | 5.28 | 14.07 |
| 2004 | 5.36 | 14.24 |
| 2005 | 5.25 | 14.06 |
| 2006 | 5.30 | 14.35 |
| 2007 | 5.25 | 13.74 |
| 2008 | 5.07 | 14.03 |
| 2009 | 4.80 | 13.13 |
| 2010 | 4.82 | 13.99 |
| 2011 | 4.70 | 13.40 |
| 2012 | 4.80 | 13.57 |
| 2013 | 4.55 | 13.78 |
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