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| year | consumption | change |
| 1980 | .80 | NA |
| 1981 | 1.00 | 25.00% |
| 1982 | 1.30 | 30.00% |
| 1983 | 1.60 | 23.08% |
| 1984 | 2.00 | 25.00% |
| 1985 | 2.40 | 20.00% |
| 1986 | 3.00 | 25.00% |
| 1987 | 3.20 | 6.67% |
| 1988 | 3.70 | 15.63% |
| 1989 | 4.00 | 8.11% |
| 1990 | 3.70 | -7.50% |
| 1991 | 3.80 | 2.70% |
| 1992 | 4.20 | 10.53% |
| 1993 | 4.80 | 14.29% |
| 1994 | 5.00 | 4.17% |
| 1995 | 5.20 | 4.00% |
| 1996 | 5.50 | 5.77% |
| 1997 | 5.80 | 5.45% |
| 1998 | 6.40 | 10.34% |
| 1999 | 6.40 | 0.00% |
| 2000 | 6.70 | 4.69% |
| 2001 | 7.30 | 8.96% |
| 2002 | 7.60 | 4.11% |
| 2003 | 7.80 | 2.63% |
| 2004 | 8.70 | 11.54% |
| 2005 | 9.10 | 4.60% |
| 2006 | 10.00 | 9.89% |
| 2007 | 10.00 | 0.00% |
| 2008 | 12.00 | 20.00% |
| 2009 | 13.00 | 8.33% |
| 2010 | 15.00 | 15.38% |
| 2011 | 17.00 | 13.33% |
| 2012 | 20.00 | 17.65% |
| 2013 | 23.00 | 15.00% |
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