|
| year | consumption | change |
| 1980 | 19,877.00 | NA |
| 1981 | 19,404.00 | -2.38 % |
| 1982 | 18,001.00 | -7.23 % |
| 1983 | 16,835.00 | -6.48 % |
| 1984 | 17,951.00 | 6.63 % |
| 1985 | 17,281.00 | -3.73 % |
| 1986 | 16,221.00 | -6.13 % |
| 1987 | 17,210.81 | 6.10 % |
| 1988 | 18,030.00 | 4.76 % |
| 1989 | 19,119.00 | 6.04 % |
| 1990 | 19,174.00 | 0.29 % |
| 1991 | 19,562.00 | 2.02 % |
| 1992 | 20,228.00 | 3.40 % |
| 1993 | 20,789.51 | 2.78 % |
| 1994 | 21,247.00 | 2.20 % |
| 1995 | 22,207.00 | 4.52 % |
| 1996 | 22,609.00 | 1.81 % |
| 1997 | 22,737.00 | 0.57 % |
| 1998 | 22,246.00 | -2.16 % |
| 1999 | 22,405.00 | 0.71 % |
| 2000 | 23,333.00 | 4.14 % |
| 2001 | 22,239.00 | -4.69 % |
| 2002 | 23,007.00 | 3.45 % |
| 2003 | 22,277.00 | -3.17 % |
| 2004 | 22,403.00 | 0.57 % |
| 2005 | 22,014.00 | -1.74 % |
| 2006 | 21,699.00 | -1.43 % |
| 2007 | 23,104.00 | 6.47 % |
| 2008 | 23,277.00 | 0.75 % |
| 2009 | 22,910.00 | -1.58 % |
| 2010 | 24,087.00 | 5.14 % |
| 2011 | 24,385.00 | 1.24 % |
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