|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.66 | NA |
| 1987 | 3.11 | 16.80 % |
| 1988 | 4.58 | 47.47 % |
| 1989 | 4.38 | -4.47 % |
| 1990 | 3.17 | -27.71 % |
| 1991 | 3.17 | 0.19 % |
| 1992 | 3.36 | 5.93 % |
| 1993 | 3.79 | 12.68 % |
| 1994 | 3.47 | -8.33 % |
| 1995 | 4.87 | 40.27 % |
| 1996 | 4.01 | -17.63 % |
| 1997 | 4.51 | 12.59 % |
| 1998 | 4.21 | -6.71 % |
| 1999 | 6.62 | 57.26 % |
| 2000 | 4.11 | -37.90 % |
| 2001 | 4.14 | 0.68 % |
| 2002 | 2.65 | -35.91 % |
| 2003 | 4.28 | 61.27 % |
| 2004 | 3.01 | -29.67 % |
| 2005 | 3.07 | 1.86 % |
| 2006 | 3.83 | 24.80 % |
| 2007 | 3.92 | 2.52 % |
| 2008 | 4.87 | 24.19 % |
| 2009 | 2.96 | -39.21 % |
| 2010 | 3.24 | 9.29 % |
|
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