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| year | consumption | change |
| 1980 | .70 | NA |
| 1981 | .80 | 14.29% |
| 1982 | .80 | 0.00% |
| 1983 | .90 | 12.50% |
| 1984 | 1.00 | 11.11% |
| 1985 | 1.40 | 40.00% |
| 1986 | 1.80 | 28.57% |
| 1987 | 2.70 | 50.00% |
| 1988 | 2.80 | 3.70% |
| 1989 | 2.80 | 0.00% |
| 1990 | 2.30 | -17.86% |
| 1991 | 2.60 | 13.04% |
| 1992 | 2.50 | -3.85% |
| 1993 | 2.60 | 4.00% |
| 1994 | 2.80 | 7.69% |
| 1995 | 3.30 | 17.86% |
| 1996 | 4.00 | 21.21% |
| 1997 | 3.50 | -12.50% |
| 1998 | 3.80 | 8.57% |
| 1999 | 3.90 | 2.63% |
| 2000 | 4.20 | 7.69% |
| 2001 | 4.30 | 2.38% |
| 2002 | 4.40 | 2.33% |
| 2003 | 4.20 | -4.55% |
| 2004 | 4.20 | 0.00% |
| 2005 | 4.50 | 7.14% |
| 2006 | 4.90 | 8.89% |
| 2007 | 5.40 | 10.20% |
| 2008 | 5.70 | 5.56% |
| 2009 | 6.20 | 8.77% |
| 2010 | 6.80 | 9.68% |
| 2011 | 7.50 | 10.29% |
| 2012 | 8.10 | 8.00% |
| 2013 | 8.90 | 9.88% |
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