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| year | consumption | change |
| 1992 | .33 | NA |
| 1993 | .20 | -39.63% |
| 1994 | .16 | -21.21% |
| 1995 | .15 | -3.21% |
| 1996 | .16 | 5.30% |
| 1997 | .11 | -33.33% |
| 1998 | .17 | 55.66% |
| 1999 | .14 | -12.73% |
| 2000 | .14 | -4.17% |
| 2001 | .13 | -8.70% |
| 2002 | .14 | 14.29% |
| 2003 | .13 | -9.03% |
| 2004 | .14 | 3.82% |
| 2005 | .15 | 11.76% |
| 2006 | .14 | -7.89% |
| 2007 | .17 | 18.57% |
| 2008 | .18 | 6.63% |
| 2009 | .18 | 0.56% |
| 2010 | .19 | 8.43% |
| 2011 | .18 | -8.29% |
| 2012 | .18 | 3.95% |
| 2013 | .20 | 7.07% |
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