|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 4.70 | NA |
| 1987 | 4.91 | 4.42 % |
| 1988 | 5.01 | 2.10 % |
| 1989 | 4.91 | -2.06 % |
| 1990 | | NA |
| 1991 | 1.87 | NA |
| 1992 | 2.80 | 49.59 % |
| 1993 | 2.34 | -16.44 % |
| 1994 | 3.51 | 50.02 % |
| 1995 | 3.62 | 3.32 % |
| 1996 | 3.61 | -0.27 % |
| 1997 | 4.14 | 14.64 % |
| 1998 | 3.18 | -23.13 % |
| 1999 | 2.92 | -8.23 % |
| 2000 | 2.91 | -0.27 % |
| 2001 | 2.45 | -15.77 % |
| 2002 | 3.23 | 31.43 % |
| 2003 | 3.39 | 5.07 % |
| 2004 | 4.08 | 20.36 % |
| 2005 | 3.62 | -11.19 % |
| 2006 | 4.86 | 34.19 % |
| 2007 | 3.67 | -24.52 % |
| 2008 | 2.31 | -36.94 % |
| 2009 | 1.31 | -43.43 % |
| 2010 | 2.76 | 110.71 % |
|
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