|
| year | consumption | change |
| 1980 | 2.29 | NA |
| 1981 | 2.24 | -2.01 % |
| 1982 | 2.07 | -7.55 % |
| 1983 | 1.99 | -3.89 % |
| 1984 | 2.08 | 4.56 % |
| 1985 | 2.05 | -1.62 % |
| 1986 | 2.00 | -2.71 % |
| 1987 | 2.05 | 2.95 % |
| 1988 | 2.04 | -0.61 % |
| 1989 | 2.15 | 5.21 % |
| 1990 | 2.17 | 0.88 % |
| 1991 | 2.22 | 2.46 % |
| 1992 | 2.17 | -2.29 % |
| 1993 | 2.03 | -6.35 % |
| 1994 | 2.35 | 15.62 % |
| 1995 | 2.47 | 5.17 % |
| 1996 | 2.54 | 2.65 % |
| 1997 | 2.69 | 6.25 % |
| 1998 | 2.75 | 2.18 % |
| 1999 | 2.95 | 6.97 % |
| 2000 | 2.94 | -0.07 % |
| 2001 | 3.14 | 6.74 % |
| 2002 | 3.19 | 1.52 % |
| 2003 | 3.37 | 5.58 % |
| 2004 | 3.54 | 5.25 % |
| 2005 | 3.58 | 0.94 % |
| 2006 | 3.71 | 3.77 % |
| 2007 | 3.69 | -0.60 % |
| 2008 | 3.80 | 3.00 % |
| 2009 | 3.66 | -3.61 % |
| 2010 | 3.83 | 4.42 % |
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