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| year | production | consumption |
| 1992 | 1.80 | 1.68 |
| 1993 | 1.91 | 1.72 |
| 1994 | 2.05 | 1.76 |
| 1995 | 2.15 | 1.86 |
| 1996 | 2.15 | 1.88 |
| 1997 | 2.18 | 1.88 |
| 1998 | 2.39 | 1.85 |
| 1999 | 2.39 | 1.86 |
| 2000 | 2.41 | 1.96 |
| 2001 | 2.65 | 2.05 |
| 2002 | 2.46 | 2.10 |
| 2003 | 2.46 | 2.13 |
| 2004 | 2.55 | 2.25 |
| 2005 | 2.51 | 2.16 |
| 2006 | 2.59 | 2.23 |
| 2007 | 2.67 | 2.23 |
| 2008 | 2.79 | 2.23 |
| 2009 | 2.48 | 2.00 |
| 2010 | 2.49 | 1.97 |
| 2011 | 2.61 | 2.14 |
| 2012 | 2.62 | 2.19 |
| 2013 | 2.49 | 2.04 |
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