|
| year | consumption | change |
| 1984 | 20.45 | NA |
| 1985 | 19.47 | -4.82 % |
| 1986 | 20.07 | 3.11 % |
| 1987 | 19.29 | -3.90 % |
| 1988 | 19.78 | 2.56 % |
| 1989 | 19.93 | 0.74 % |
| 1990 | 20.49 | 2.79 % |
| 1991 | 20.95 | 2.26 % |
| 1992 | 22.42 | 6.99 % |
| 1993 | 22.06 | -1.58 % |
| 1994 | 22.78 | 3.25 % |
| 1995 | 24.01 | 5.41 % |
| 1996 | 25.37 | 5.67 % |
| 1997 | 27.21 | 7.23 % |
| 1998 | 30.24 | 11.14 % |
| 1999 | 32.74 | 8.27 % |
| 2000 | 34.47 | 5.29 % |
| 2001 | 35.91 | 4.18 % |
| 2002 | 36.69 | 2.18 % |
| 2003 | 36.64 | -0.14 % |
| 2004 | 37.57 | 2.52 % |
| 2005 | 39.63 | 5.50 % |
| 2006 | 43.48 | 9.71 % |
| 2007 | 42.30 | -2.71 % |
| 2008 | 40.04 | -5.34 % |
| 2009 | 36.67 | -8.41 % |
| 2010 | 33.71 | -8.08 % |
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