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| year | consumption | change |
| 1980 | .06 | NA |
| 1981 | .06 | 0.00% |
| 1982 | .06 | 6.90% |
| 1983 | .07 | 8.06% |
| 1984 | .06 | -10.45% |
| 1985 | .07 | 21.67% |
| 1986 | .07 | 1.37% |
| 1987 | .08 | 1.35% |
| 1988 | .08 | 4.00% |
| 1989 | .08 | -2.56% |
| 1990 | .08 | 5.26% |
| 1991 | .08 | 3.75% |
| 1992 | .09 | 3.61% |
| 1993 | .08 | -2.33% |
| 1994 | .08 | -2.38% |
| 1995 | .09 | 7.32% |
| 1996 | .08 | -4.55% |
| 1997 | .09 | 10.71% |
| 1998 | .09 | -8.60% |
| 1999 | .09 | 10.59% |
| 2000 | .09 | -3.19% |
| 2001 | .12 | 30.77% |
| 2002 | .13 | 6.72% |
| 2003 | .14 | 6.30% |
| 2004 | .15 | 7.41% |
| 2005 | .15 | 2.07% |
| 2006 | .17 | 12.16% |
| 2007 | .19 | 15.66% |
| 2008 | .22 | 14.06% |
| 2009 | .26 | 17.35% |
| 2010 | .28 | 7.78% |
| 2011 | .29 | 3.25% |
| 2012 | .30 | 3.85% |
| 2013 | .33 | 11.78% |
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