|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.11 | NA |
| 1987 | 2.36 | 11.94 % |
| 1988 | 2.38 | 0.89 % |
| 1989 | 2.53 | 6.43 % |
| 1990 | 2.61 | 2.86 % |
| 1991 | 2.71 | 3.90 % |
| 1992 | 2.61 | -3.57 % |
| 1993 | 2.85 | 9.23 % |
| 1994 | 2.92 | 2.46 % |
| 1995 | 2.92 | 0.00 % |
| 1996 | 2.94 | 0.52 % |
| 1997 | 2.99 | 1.87 % |
| 1998 | 2.99 | 0.00 % |
| 1999 | 2.99 | 0.00 % |
| 2000 | 3.15 | 5.18 % |
| 2001 | 3.20 | 1.76 % |
| 2002 | 3.27 | 2.19 % |
| 2003 | 3.39 | 3.57 % |
| 2004 | 3.50 | 3.17 % |
| 2005 | 3.62 | 3.62 % |
| 2006 | 3.67 | 1.29 % |
| 2007 | 3.69 | 0.64 % |
| 2008 | 3.74 | 1.27 % |
| 2009 | 3.15 | -15.63 % |
| 2010 | 3.15 | 0.00 % |
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