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| year | consumption | change |
| 1986 | 1.30 | NA |
| 1987 | .30 | -76.92% |
| 1988 | 1.70 | 466.67% |
| 1989 | 1.80 | 5.88% |
| 1990 | 2.00 | 11.11% |
| 1991 | 2.10 | 5.00% |
| 1992 | 2.20 | 4.76% |
| 1993 | 2.30 | 4.55% |
| 1994 | 4.50 | 95.65% |
| 1995 | 1.90 | -57.78% |
| 1996 | 2.80 | 47.37% |
| 1997 | 3.30 | 17.86% |
| 1998 | 3.40 | 3.03% |
| 1999 | 3.80 | 11.76% |
| 2000 | 3.70 | -2.63% |
| 2001 | 3.70 | 0.00% |
| 2002 | 3.60 | -2.70% |
| 2003 | 3.10 | -13.89% |
| 2004 | 2.80 | -9.68% |
| 2005 | 2.70 | -3.57% |
| 2006 | 2.90 | 7.41% |
| 2007 | 3.30 | 13.79% |
| 2008 | 3.00 | -9.09% |
| 2009 | 4.10 | 36.67% |
| 2010 | 4.20 | 2.44% |
| 2011 | 4.40 | 4.76% |
| 2012 | 4.60 | 4.55% |
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