|
| year | consumption | change |
| 1980 | 3,752,173.00 | NA |
| 1981 | 3,842,971.00 | 2.42 % |
| 1982 | 3,934,206.00 | 2.37 % |
| 1983 | 4,052,016.00 | 2.99 % |
| 1984 | 4,295,920.00 | 6.02 % |
| 1985 | 4,466,703.00 | 3.98 % |
| 1986 | 4,557,155.00 | 2.03 % |
| 1987 | 4,716,073.00 | 3.49 % |
| 1988 | 4,870,025.00 | 3.26 % |
| 1989 | 4,879,230.00 | 0.19 % |
| 1990 | 4,876,462.00 | -0.06 % |
| 1991 | 4,852,972.00 | -0.48 % |
| 1992 | 4,763,499.00 | -1.84 % |
| 1993 | 4,851,878.00 | 1.86 % |
| 1994 | 4,899,160.00 | 0.97 % |
| 1995 | 4,991,184.00 | 1.88 % |
| 1996 | 5,108,139.00 | 2.34 % |
| 1997 | 5,124,380.00 | 0.32 % |
| 1998 | 5,143,400.00 | 0.37 % |
| 1999 | 5,066,957.00 | -1.49 % |
| 2000 | 5,281,835.00 | 4.24 % |
| 2001 | 5,328,020.00 | 0.87 % |
| 2002 | 5,438,449.00 | 2.07 % |
| 2003 | 5,786,472.00 | 6.40 % |
| 2004 | 6,094,762.00 | 5.33 % |
| 2005 | 6,492,269.00 | 6.52 % |
| 2006 | 6,801,781.00 | 4.77 % |
| 2007 | 7,103,233.00 | 4.43 % |
| 2008 | 7,316,677.00 | 3.00 % |
| 2009 | 7,487,077.00 | 2.33 % |
| 2010 | 7,770,280.00 | 3.78 % |
| 2011 | 8,144,308.00 | 4.81 % |
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