|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 154.63 | NA |
| 1987 | 171.11 | 10.65 % |
| 1988 | 190.52 | 11.34 % |
| 1989 | 206.73 | 8.51 % |
| 1990 | 235.01 | 13.68 % |
| 1991 | 250.68 | 6.67 % |
| 1992 | 275.56 | 9.93 % |
| 1993 | 298.56 | 8.35 % |
| 1994 | 306.80 | 2.76 % |
| 1995 | 343.87 | 12.08 % |
| 1996 | 350.45 | 1.91 % |
| 1997 | 368.03 | 5.02 % |
| 1998 | 354.20 | -3.76 % |
| 1999 | 358.73 | 1.28 % |
| 2000 | 407.08 | 13.48 % |
| 2001 | 423.63 | 4.06 % |
| 2002 | 445.21 | 5.09 % |
| 2003 | 431.34 | -3.12 % |
| 2004 | 473.95 | 9.88 % |
| 2005 | 482.35 | 1.77 % |
| 2006 | 465.87 | -3.42 % |
| 2007 | 468.53 | 0.57 % |
| 2008 | 472.56 | 0.86 % |
| 2009 | 454.04 | -3.92 % |
| 2010 | 478.50 | 5.39 % |
|
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