|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 1.04 | NA |
| 1987 | .87 | -16.88 % |
| 1988 | 1.56 | 79.42 % |
| 1989 | 1.29 | -17.16 % |
| 1990 | .89 | -31.05 % |
| 1991 | 1.58 | 77.46 % |
| 1992 | 1.64 | 3.82 % |
| 1993 | 1.97 | 20.23 % |
| 1994 | 2.60 | 32.11 % |
| 1995 | 2.20 | -15.49 % |
| 1996 | 3.52 | 59.99 % |
| 1997 | 3.47 | -1.46 % |
| 1998 | 3.74 | 7.93 % |
| 1999 | 4.13 | 10.25 % |
| 2000 | 4.50 | 9.09 % |
| 2001 | 4.69 | 4.24 % |
| 2002 | 4.03 | -14.14 % |
| 2003 | 5.59 | 38.65 % |
| 2004 | 5.19 | -7.03 % |
| 2005 | 5.43 | 4.56 % |
| 2006 | 6.67 | 22.76 % |
| 2007 | 6.86 | 2.96 % |
| 2008 | 6.96 | 1.39 % |
| 2009 | 7.36 | 5.81 % |
| 2010 | 7.81 | 6.04 % |
|
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