|
| year | consumption | change |
| 1980 | 643.00 | NA |
| 1981 | 729.00 | 13.37 % |
| 1982 | 737.00 | 1.10 % |
| 1983 | 773.00 | 4.88 % |
| 1984 | 824.00 | 6.60 % |
| 1985 | 894.90 | 8.60 % |
| 1986 | 947.44 | 5.87 % |
| 1987 | 987.85 | 4.27 % |
| 1988 | 1,083.78 | 9.71 % |
| 1989 | 1,149.78 | 6.09 % |
| 1990 | 1,168.33 | 1.61 % |
| 1991 | 1,190.32 | 1.88 % |
| 1992 | 1,274.91 | 7.11 % |
| 1993 | 1,311.07 | 2.84 % |
| 1994 | 1,413.27 | 7.80 % |
| 1995 | 1,574.67 | 11.42 % |
| 1996 | 1,680.92 | 6.75 % |
| 1997 | 1,765.49 | 5.03 % |
| 1998 | 1,844.37 | 4.47 % |
| 1999 | 2,031.25 | 10.13 % |
| 2000 | 2,127.44 | 4.74 % |
| 2001 | 2,183.73 | 2.65 % |
| 2002 | 2,263.44 | 3.65 % |
| 2003 | 2,346.33 | 3.66 % |
| 2004 | 2,429.62 | 3.55 % |
| 2005 | 2,512.43 | 3.41 % |
| 2006 | 2,690.90 | 7.10 % |
| 2007 | 2,800.75 | 4.08 % |
| 2008 | 2,864.00 | 2.26 % |
| 2009 | 3,112.74 | 8.68 % |
| 2010 | 3,255.39 | 4.58 % |
| 2011 | 3,426.00 | 5.24 % |
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