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| year | consumption | change |
| 1980 | .79 | NA |
| 1981 | .67 | -15.14% |
| 1982 | .98 | 46.33% |
| 1983 | 1.07 | 10.04% |
| 1984 | 1.15 | 6.89% |
| 1985 | 1.05 | -8.54% |
| 1986 | 1.07 | 2.29% |
| 1987 | 1.15 | 6.98% |
| 1988 | 1.22 | 6.35% |
| 1989 | 1.18 | -3.44% |
| 1990 | 1.25 | 5.51% |
| 1991 | 1.36 | 9.00% |
| 1992 | 1.30 | -3.98% |
| 1993 | 1.20 | -7.75% |
| 1994 | 1.24 | 3.16% |
| 1995 | 1.29 | 4.11% |
| 1996 | 1.26 | -2.63% |
| 1997 | 1.20 | -4.38% |
| 1998 | 1.25 | 4.24% |
| 1999 | 1.25 | -0.40% |
| 2000 | 1.24 | -0.96% |
| 2001 | 1.25 | 1.46% |
| 2002 | 1.28 | 1.67% |
| 2003 | 1.29 | 1.10% |
| 2004 | 1.25 | -3.03% |
| 2005 | 1.48 | 18.40% |
| 2006 | 1.54 | 4.05% |
| 2007 | 1.61 | 4.48% |
| 2008 | 1.74 | 7.96% |
| 2009 | 1.84 | 5.76% |
| 2010 | 1.86 | 1.20% |
| 2011 | 2.00 | 7.58% |
| 2012 | 2.11 | 5.65% |
| 2013 | 2.13 | 0.62% |
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