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| year | consumption | change |
| 1980 | 1.90 | NA |
| 1981 | 2.10 | 10.53% |
| 1982 | 2.10 | 0.00% |
| 1983 | 2.20 | 4.76% |
| 1984 | 2.40 | 9.09% |
| 1985 | 2.50 | 4.17% |
| 1986 | 2.70 | 8.00% |
| 1987 | 3.10 | 14.81% |
| 1988 | 3.00 | -3.23% |
| 1989 | 3.20 | 6.67% |
| 1990 | 3.30 | 3.13% |
| 1991 | 3.60 | 9.09% |
| 1992 | 4.20 | 16.67% |
| 1993 | 4.50 | 7.14% |
| 1994 | 4.80 | 6.67% |
| 1995 | 4.30 | -10.42% |
| 1996 | 4.50 | 4.65% |
| 1997 | 5.00 | 11.11% |
| 1998 | 4.80 | -4.00% |
| 1999 | 5.50 | 14.58% |
| 2000 | 5.90 | 7.27% |
| 2001 | 6.10 | 3.39% |
| 2002 | 6.30 | 3.28% |
| 2003 | 6.60 | 4.76% |
| 2004 | 6.80 | 3.03% |
| 2005 | 7.30 | 7.35% |
| 2006 | 7.80 | 6.85% |
| 2007 | 8.20 | 5.13% |
| 2008 | 8.30 | 1.22% |
| 2009 | 8.20 | -1.20% |
| 2010 | 8.50 | 3.66% |
| 2011 | 8.60 | 1.18% |
| 2012 | 9.00 | 4.65% |
| 2013 | 8.90 | -1.11% |
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