|
| year | consumption | change |
| 1980 | .70 | NA |
| 1981 | .72 | 2.74 % |
| 1982 | .77 | 7.18 % |
| 1983 | .78 | 1.54 % |
| 1984 | .85 | 9.51 % |
| 1985 | .86 | 1.26 % |
| 1986 | .90 | 4.32 % |
| 1987 | .82 | -8.53 % |
| 1988 | .92 | 11.57 % |
| 1989 | .95 | 3.67 % |
| 1990 | .89 | -6.63 % |
| 1991 | .97 | 8.62 % |
| 1992 | .98 | 1.00 % |
| 1993 | 1.00 | 2.47 % |
| 1994 | 1.10 | 9.96 % |
| 1995 | 1.09 | -0.49 % |
| 1996 | 1.19 | 8.68 % |
| 1997 | 1.23 | 3.20 % |
| 1998 | 1.24 | 0.98 % |
| 1999 | 1.18 | -4.87 % |
| 2000 | 1.17 | -0.61 % |
| 2001 | 1.16 | -0.73 % |
| 2002 | 1.16 | -0.29 % |
| 2003 | 1.20 | 3.65 % |
| 2004 | 1.22 | 1.12 % |
| 2005 | 1.27 | 4.31 % |
| 2006 | 1.31 | 3.50 % |
| 2007 | 1.33 | 1.53 % |
| 2008 | 1.34 | 0.74 % |
| 2009 | 1.34 | -0.55 % |
| 2010 | 1.37 | 2.34 % |
|
|