|
| year | consumption | change |
| 1980 | 312.00 | NA |
| 1981 | 324.00 | 3.85 % |
| 1982 | 349.00 | 7.72 % |
| 1983 | 338.00 | -3.15 % |
| 1984 | 360.00 | 6.51 % |
| 1985 | 350.00 | -2.78 % |
| 1986 | 349.96 | -0.01 % |
| 1987 | 344.52 | -1.55 % |
| 1988 | 342.30 | -0.65 % |
| 1989 | 348.19 | 1.72 % |
| 1990 | 375.00 | 7.70 % |
| 1991 | 402.51 | 7.34 % |
| 1992 | 411.62 | 2.26 % |
| 1993 | 402.11 | -2.31 % |
| 1994 | 409.56 | 1.85 % |
| 1995 | 421.07 | 2.81 % |
| 1996 | 427.73 | 1.58 % |
| 1997 | 438.70 | 2.56 % |
| 1998 | 450.77 | 2.75 % |
| 1999 | 465.67 | 3.30 % |
| 2000 | 457.93 | -1.66 % |
| 2001 | 458.24 | 0.07 % |
| 2002 | 475.44 | 3.75 % |
| 2003 | 490.21 | 3.11 % |
| 2004 | 503.91 | 2.79 % |
| 2005 | 536.63 | 6.49 % |
| 2006 | 550.63 | 2.61 % |
| 2007 | 560.84 | 1.85 % |
| 2008 | 526.94 | -6.04 % |
| 2009 | 532.61 | 1.08 % |
| 2010 | 549.41 | 3.15 % |
| 2011 | 610.00 | 11.03 % |
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