|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 1.41 | NA |
| 1987 | 2.04 | 44.33 % |
| 1988 | .99 | -51.43 % |
| 1989 | 2.73 | 175.60 % |
| 1990 | 3.80 | 39.34 % |
| 1991 | 3.52 | -7.45 % |
| 1992 | 3.89 | 10.48 % |
| 1993 | 4.35 | 11.99 % |
| 1994 | 4.41 | 1.28 % |
| 1995 | 4.41 | 0.02 % |
| 1996 | 4.40 | -0.27 % |
| 1997 | 4.41 | 0.31 % |
| 1998 | 4.47 | 1.33 % |
| 1999 | 4.62 | 3.31 % |
| 2000 | 4.62 | 0.12 % |
| 2001 | 2.23 | -51.84 % |
| 2002 | 2.24 | 0.82 % |
| 2003 | 2.37 | 5.69 % |
| 2004 | 2.51 | 5.86 % |
| 2005 | 2.66 | 6.09 % |
| 2006 | 2.79 | 4.79 % |
| 2007 | 3.17 | 13.73 % |
| 2008 | 3.39 | 6.90 % |
| 2009 | 3.58 | 5.38 % |
| 2010 | 3.81 | 6.63 % |
|
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