|
| year | consumption | change |
| 1980 | 1.59 | NA |
| 1981 | 1.72 | 8.50 % |
| 1982 | 1.75 | 1.36 % |
| 1983 | 1.68 | -3.60 % |
| 1984 | 1.71 | 1.78 % |
| 1985 | 1.74 | 1.68 % |
| 1986 | 1.89 | 8.29 % |
| 1987 | 1.92 | 1.92 % |
| 1988 | 1.94 | 0.71 % |
| 1989 | 2.06 | 6.48 % |
| 1990 | 2.09 | 1.19 % |
| 1991 | 2.21 | 5.95 % |
| 1992 | 2.22 | 0.30 % |
| 1993 | 2.07 | -6.70 % |
| 1994 | 2.44 | 17.76 % |
| 1995 | 2.47 | 1.36 % |
| 1996 | 2.58 | 4.31 % |
| 1997 | 2.66 | 3.31 % |
| 1998 | 2.85 | 7.22 % |
| 1999 | 2.65 | -7.25 % |
| 2000 | 2.77 | 4.61 % |
| 2001 | 3.03 | 9.45 % |
| 2002 | 2.93 | -3.17 % |
| 2003 | 2.72 | -7.24 % |
| 2004 | 2.94 | 7.89 % |
| 2005 | 2.92 | -0.69 % |
| 2006 | 3.16 | 8.30 % |
| 2007 | 3.07 | -2.93 % |
| 2008 | 3.23 | 5.18 % |
| 2009 | 3.04 | -5.78 % |
| 2010 | 3.32 | 9.29 % |
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