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| year | consumption | change |
| 1980 | 1.05 | NA |
| 1981 | .97 | -8.25% |
| 1982 | 1.10 | 14.17% |
| 1983 | 1.14 | 3.53% |
| 1984 | 1.22 | 6.82% |
| 1985 | 1.33 | 8.93% |
| 1986 | 1.50 | 12.41% |
| 1987 | 1.65 | 10.23% |
| 1988 | 1.70 | 2.97% |
| 1989 | 1.80 | 5.95% |
| 1990 | 1.97 | 9.68% |
| 1991 | 2.06 | 4.61% |
| 1992 | 2.13 | 3.05% |
| 1993 | 2.33 | 9.41% |
| 1994 | 2.23 | -4.17% |
| 1995 | 2.49 | 11.66% |
| 1996 | 2.74 | 10.16% |
| 1997 | 2.92 | 6.46% |
| 1998 | 2.99 | 2.36% |
| 1999 | 2.90 | -2.95% |
| 2000 | 3.16 | 8.79% |
| 2001 | 2.89 | -8.49% |
| 2002 | 3.14 | 8.73% |
| 2003 | 3.31 | 5.32% |
| 2004 | 3.51 | 6.08% |
| 2005 | 3.73 | 6.27% |
| 2006 | 4.07 | 9.12% |
| 2007 | 4.35 | 6.86% |
| 2008 | 4.24 | -2.42% |
| 2009 | 4.24 | 0.00% |
| 2010 | 4.48 | 5.71% |
| 2011 | 5.25 | 17.11% |
| 2012 | 5.40 | 2.88% |
| 2013 | 5.22 | -3.28% |
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