|
| year | consumption | change |
| 1980 | 1,039,640.00 | NA |
| 1981 | 1,050,883.00 | 1.08 % |
| 1982 | 1,072,469.00 | 2.05 % |
| 1983 | 1,096,131.00 | 2.21 % |
| 1984 | 1,122,908.00 | 2.44 % |
| 1985 | 1,206,174.00 | 7.42 % |
| 1986 | 1,224,494.00 | 1.52 % |
| 1987 | 1,250,514.00 | 2.12 % |
| 1988 | 1,224,199.00 | -2.10 % |
| 1989 | 1,246,350.00 | 1.81 % |
| 1990 | 1,150,547.00 | -7.69 % |
| 1991 | 1,220,209.00 | 6.05 % |
| 1992 | 1,632,337.00 | 33.78 % |
| 1993 | 1,626,233.00 | -0.37 % |
| 1994 | 1,524,761.00 | -6.24 % |
| 1995 | 1,493,534.00 | -2.05 % |
| 1996 | 1,485,835.00 | -0.52 % |
| 1997 | 1,430,618.00 | -3.72 % |
| 1998 | 1,384,823.00 | -3.20 % |
| 1999 | 1,326,889.00 | -4.18 % |
| 2000 | 1,384,686.00 | 4.36 % |
| 2001 | 1,358,341.00 | -1.90 % |
| 2002 | 1,357,720.00 | -0.05 % |
| 2003 | 1,395,398.00 | 2.78 % |
| 2004 | 1,374,243.00 | -1.52 % |
| 2005 | 1,359,279.00 | -1.09 % |
| 2006 | 1,390,575.00 | 2.30 % |
| 2007 | 1,408,551.00 | 1.29 % |
| 2008 | 1,380,472.00 | -1.99 % |
| 2009 | 1,284,039.00 | -6.99 % |
| 2010 | 1,306,719.00 | 1.77 % |
| 2011 | 1,355,620.00 | 3.74 % |
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