|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 24.06 | NA |
| 1987 | 25.85 | 7.45 % |
| 1988 | 28.49 | 10.20 % |
| 1989 | 31.19 | 9.46 % |
| 1990 | 31.29 | 0.33 % |
| 1991 | 34.71 | 10.91 % |
| 1992 | 38.87 | 12.01 % |
| 1993 | 45.06 | 15.92 % |
| 1994 | 44.60 | -1.03 % |
| 1995 | 45.39 | 1.77 % |
| 1996 | 50.62 | 11.53 % |
| 1997 | 51.53 | 1.80 % |
| 1998 | 54.36 | 5.49 % |
| 1999 | 55.48 | 2.06 % |
| 2000 | 56.15 | 1.21 % |
| 2001 | 50.88 | -9.39 % |
| 2002 | 50.60 | -0.55 % |
| 2003 | 48.66 | -3.83 % |
| 2004 | 49.69 | 2.12 % |
| 2005 | 52.79 | 6.25 % |
| 2006 | 55.57 | 5.26 % |
| 2007 | 51.97 | -6.47 % |
| 2008 | 53.68 | 3.28 % |
| 2009 | 57.00 | 6.18 % |
| 2010 | 58.42 | 2.50 % |
|
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