|
| year | consumption | change |
| 1980 | .63 | NA |
| 1981 | .69 | 8.50 % |
| 1982 | .78 | 14.14 % |
| 1983 | .79 | 1.30 % |
| 1984 | .82 | 3.44 % |
| 1985 | .87 | 6.47 % |
| 1986 | .93 | 6.91 % |
| 1987 | 1.01 | 7.91 % |
| 1988 | 1.08 | 7.14 % |
| 1989 | 1.13 | 5.20 % |
| 1990 | 1.18 | 3.72 % |
| 1991 | 1.25 | 6.13 % |
| 1992 | 1.31 | 4.91 % |
| 1993 | 1.36 | 3.65 % |
| 1994 | 1.53 | 12.92 % |
| 1995 | 1.58 | 3.14 % |
| 1996 | 1.67 | 5.54 % |
| 1997 | 1.69 | 1.38 % |
| 1998 | 1.72 | 1.59 % |
| 1999 | 1.80 | 4.97 % |
| 2000 | 1.85 | 2.33 % |
| 2001 | 1.80 | -2.54 % |
| 2002 | 1.81 | 0.78 % |
| 2003 | 1.91 | 5.43 % |
| 2004 | 1.97 | 2.85 % |
| 2005 | 2.14 | 8.79 % |
| 2006 | 2.38 | 11.46 % |
| 2007 | 2.48 | 4.08 % |
| 2008 | 2.48 | -0.14 % |
| 2009 | 2.50 | 1.03 % |
| 2010 | 2.56 | 2.24 % |
|
|