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| year | consumption | change |
| 1987 | .60 | NA |
| 1988 | .70 | 16.67% |
| 1989 | 1.00 | 42.86% |
| 1990 | 1.20 | 20.00% |
| 1991 | 1.00 | -16.67% |
| 1992 | 1.50 | 50.00% |
| 1993 | 1.80 | 20.00% |
| 1994 | 2.10 | 16.67% |
| 1995 | 2.60 | 23.81% |
| 1996 | 2.70 | 3.85% |
| 1997 | 3.60 | 33.33% |
| 1998 | 5.20 | 44.44% |
| 1999 | 5.80 | 11.54% |
| 2000 | 4.80 | -17.24% |
| 2001 | 4.70 | -2.08% |
| 2002 | 4.70 | 0.00% |
| 2003 | 5.00 | 6.38% |
| 2004 | 5.20 | 4.00% |
| 2005 | 5.00 | -3.85% |
| 2006 | 5.60 | 12.00% |
| 2007 | 5.70 | 1.79% |
| 2008 | 5.50 | -3.51% |
| 2009 | 5.40 | -1.82% |
| 2010 | 5.90 | 9.26% |
| 2011 | 6.30 | 6.78% |
| 2012 | 7.10 | 12.70% |
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