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| year | production | consumption |
| 1992 | 3.64 | 3.38 |
| 1993 | 3.26 | 2.90 |
| 1994 | 2.61 | 2.29 |
| 1995 | 2.33 | 2.00 |
| 1996 | 2.41 | 1.95 |
| 1997 | 2.47 | 1.68 |
| 1998 | 2.43 | 1.62 |
| 1999 | 2.63 | 1.78 |
| 2000 | 3.38 | 1.78 |
| 2001 | 3.69 | 1.92 |
| 2002 | 3.98 | 1.95 |
| 2003 | 4.16 | 1.75 |
| 2004 | 4.65 | 2.18 |
| 2005 | 4.86 | 2.22 |
| 2006 | 5.14 | 2.41 |
| 2007 | 5.29 | 2.41 |
| 2008 | 5.55 | 2.38 |
| 2009 | 5.57 | 2.03 |
| 2010 | 5.83 | 2.25 |
| 2011 | 6.09 | 2.57 |
| 2012 | 6.49 | 2.52 |
| 2013 | 6.22 | 2.56 |
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