|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 21.50 | NA |
| 1987 | 21.40 | -0.47 % |
| 1988 | 21.20 | -0.93 % |
| 1989 | 22.35 | 5.42 % |
| 1990 | 22.70 | 1.57 % |
| 1991 | 30.40 | 33.92 % |
| 1992 | 32.86 | 8.10 % |
| 1993 | 25.59 | -22.13 % |
| 1994 | 25.19 | -1.55 % |
| 1995 | 27.06 | 7.42 % |
| 1996 | 26.94 | -0.45 % |
| 1997 | 27.37 | 1.58 % |
| 1998 | 39.26 | 43.47 % |
| 1999 | 34.52 | -12.08 % |
| 2000 | 51.00 | 47.75 % |
| 2001 | 50.00 | -1.96 % |
| 2002 | 49.78 | -0.44 % |
| 2003 | 50.01 | 0.47 % |
| 2004 | 71.99 | 43.95 % |
| 2005 | 75.48 | 4.85 % |
| 2006 | 72.77 | -3.59 % |
| 2007 | 83.50 | 14.74 % |
| 2008 | 86.89 | 4.06 % |
| 2009 | 91.31 | 5.08 % |
| 2010 | 93.11 | 1.97 % |
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