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| year | consumption | change |
| 1993 | 1.61 | NA |
| 1994 | 1.54 | -4.23% |
| 1995 | 1.58 | 2.27% |
| 1996 | 1.67 | 5.90% |
| 1997 | 1.47 | -12.22% |
| 1998 | 1.42 | -2.94% |
| 1999 | 1.33 | -6.54% |
| 2000 | 1.39 | 4.59% |
| 2001 | 1.44 | 3.31% |
| 2002 | 1.43 | -0.14% |
| 2003 | 1.50 | 4.46% |
| 2004 | 1.52 | 1.13% |
| 2005 | 1.54 | 1.72% |
| 2006 | 1.59 | 3.31% |
| 2007 | 1.64 | 2.76% |
| 2008 | 1.63 | -0.67% |
| 2009 | 1.53 | -5.97% |
| 2010 | 1.59 | 4.19% |
| 2011 | 1.76 | 10.49% |
| 2012 | 1.74 | -1.19% |
| 2013 | 1.71 | -1.67% |
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