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| year | consumption | change |
| 1992 | 1.53 | NA |
| 1993 | 1.29 | -15.89% |
| 1994 | 1.08 | -16.33% |
| 1995 | 1.01 | -6.13% |
| 1996 | 1.01 | 0.00% |
| 1997 | 1.00 | -1.39% |
| 1998 | .97 | -2.21% |
| 1999 | .99 | 1.13% |
| 2000 | 1.05 | 6.60% |
| 2001 | .96 | -8.57% |
| 2002 | .91 | -5.73% |
| 2003 | .98 | 8.51% |
| 2004 | .95 | -3.36% |
| 2005 | 1.12 | 18.23% |
| 2006 | 1.15 | 2.67% |
| 2007 | 1.15 | -0.26% |
| 2008 | 1.12 | -2.44% |
| 2009 | 1.05 | -6.42% |
| 2010 | 1.13 | 7.34% |
| 2011 | 1.17 | 3.55% |
| 2012 | 1.15 | -1.54% |
| 2013 | 1.24 | 7.75% |
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