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| year | consumption | change |
| 1992 | .28 | NA |
| 1993 | .20 | -27.27% |
| 1994 | .15 | -23.00% |
| 1995 | .14 | -10.39% |
| 1996 | .15 | 8.70% |
| 1997 | .15 | 1.33% |
| 1998 | .14 | -7.24% |
| 1999 | .11 | -21.28% |
| 2000 | .11 | 0.90% |
| 2001 | .11 | -2.68% |
| 2002 | .12 | 9.17% |
| 2003 | .13 | 9.24% |
| 2004 | .13 | -3.08% |
| 2005 | .13 | 5.56% |
| 2006 | .14 | 4.51% |
| 2007 | .13 | -5.04% |
| 2008 | .14 | 4.55% |
| 2009 | .12 | -11.59% |
| 2010 | .12 | -0.82% |
| 2011 | .12 | -2.48% |
| 2012 | .16 | 33.05% |
| 2013 | .17 | 5.73% |
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