|
| year | consumption | change |
| 1980 | 31,469.89 | NA |
| 1981 | 31,378.39 | -0.29 % |
| 1982 | 32,021.04 | 2.05 % |
| 1983 | 30,599.06 | -4.44 % |
| 1984 | 30,967.23 | 1.20 % |
| 1985 | 28,958.82 | -6.49 % |
| 1986 | 29,304.95 | 1.20 % |
| 1987 | 29,117.55 | -0.64 % |
| 1988 | 26,977.97 | -7.35 % |
| 1989 | 25,347.65 | -6.04 % |
| 1990 | 22,945.71 | -9.48 % |
| 1991 | 22,318.50 | -2.73 % |
| 1992 | 21,025.49 | -5.79 % |
| 1993 | 19,625.55 | -6.66 % |
| 1994 | 18,561.82 | -5.42 % |
| 1995 | 18,408.60 | -0.83 % |
| 1996 | 19,142.74 | 3.99 % |
| 1997 | 18,764.65 | -1.98 % |
| 1998 | 18,051.45 | -3.80 % |
| 1999 | 18,306.08 | 1.41 % |
| 2000 | 16,578.76 | -9.44 % |
| 2001 | 16,868.67 | 1.75 % |
| 2002 | 15,850.13 | -6.04 % |
| 2003 | 16,362.71 | 3.23 % |
| 2004 | 14,981.51 | -8.44 % |
| 2005 | 12,924.60 | -13.73 % |
| 2006 | 13,059.08 | 1.04 % |
| 2007 | 13,019.40 | -0.30 % |
| 2008 | 12,757.05 | -2.02 % |
| 2009 | 11,655.84 | -8.63 % |
| 2010 | 11,822.29 | 1.43 % |
| 2011 | 12,423.05 | 5.08 % |
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