|
| year | consumption | change |
| 1980 | 749,074.30 | NA |
| 1981 | 780,496.90 | 4.19 % |
| 1982 | 758,847.10 | -2.77 % |
| 1983 | 792,369.90 | 4.42 % |
| 1984 | 852,428.80 | 7.58 % |
| 1985 | 878,999.90 | 3.12 % |
| 1986 | 861,930.30 | -1.94 % |
| 1987 | 901,396.00 | 4.58 % |
| 1988 | 952,524.10 | 5.67 % |
| 1989 | 964,217.30 | 1.23 % |
| 1990 | 966,992.00 | 0.29 % |
| 1991 | 963,371.90 | -0.37 % |
| 1992 | 974,367.80 | 1.14 % |
| 1993 | 1,008,869.00 | 3.54 % |
| 1994 | 1,019,725.00 | 1.08 % |
| 1995 | 1,032,723.00 | 1.27 % |
| 1996 | 1,079,693.00 | 4.55 % |
| 1997 | 1,106,625.00 | 2.49 % |
| 1998 | 1,117,440.00 | 0.98 % |
| 1999 | 1,118,915.00 | 0.13 % |
| 2000 | 1,168,907.00 | 4.47 % |
| 2001 | 1,144,778.00 | -2.06 % |
| 2002 | 1,152,515.00 | 0.68 % |
| 2003 | 1,182,812.00 | 2.63 % |
| 2004 | 1,190,274.00 | 0.63 % |
| 2005 | 1,213,050.00 | 1.91 % |
| 2006 | 1,197,741.00 | -1.26 % |
| 2007 | 1,212,196.00 | 1.21 % |
| 2008 | 1,200,108.00 | -1.00 % |
| 2009 | 1,069,812.00 | -10.86 % |
| 2010 | 1,124,933.00 | 5.15 % |
| 2011 | 1,071,818.00 | -4.72 % |
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