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| year | production | consumption |
| 1992 | 47.99 | 34.06 |
| 1993 | 44.69 | 31.86 |
| 1994 | 42.30 | 29.28 |
| 1995 | 41.42 | 27.82 |
| 1996 | 39.95 | 26.00 |
| 1997 | 38.74 | 24.43 |
| 1998 | 39.07 | 24.29 |
| 1999 | 40.81 | 25.38 |
| 2000 | 41.70 | 26.17 |
| 2001 | 42.83 | 25.85 |
| 2002 | 44.16 | 26.72 |
| 2003 | 47.16 | 27.46 |
| 2004 | 49.86 | 28.22 |
| 2005 | 51.05 | 27.95 |
| 2006 | 52.14 | 29.08 |
| 2007 | 52.61 | 29.12 |
| 2008 | 52.62 | 29.59 |
| 2009 | 50.16 | 26.47 |
| 2010 | 53.92 | 30.25 |
| 2011 | 54.86 | 30.66 |
| 2012 | 55.60 | 31.85 |
| 2013 | 54.54 | 30.52 |
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