|
| year | consumption | change |
| 1984 | 59.60 | NA |
| 1985 | 49.08 | -17.66 % |
| 1986 | 55.05 | 12.16 % |
| 1987 | 51.99 | -5.55 % |
| 1988 | 47.01 | -9.59 % |
| 1989 | 43.42 | -7.62 % |
| 1990 | 41.88 | -3.56 % |
| 1991 | 40.43 | -3.45 % |
| 1992 | 41.59 | 2.86 % |
| 1993 | 36.49 | -12.26 % |
| 1994 | 36.12 | -1.02 % |
| 1995 | 33.78 | -6.46 % |
| 1996 | 34.16 | 1.11 % |
| 1997 | 32.02 | -6.26 % |
| 1998 | 35.65 | 11.33 % |
| 1999 | 35.94 | 0.83 % |
| 2000 | 31.10 | -13.46 % |
| 2001 | 31.86 | 2.43 % |
| 2002 | 36.11 | 13.33 % |
| 2003 | 39.78 | 10.17 % |
| 2004 | 37.77 | -5.06 % |
| 2005 | 35.25 | -6.65 % |
| 2006 | 36.56 | 3.70 % |
| 2007 | 32.00 | -12.46 % |
| 2008 | 28.97 | -9.47 % |
| 2009 | 23.89 | -17.53 % |
| 2010 | 27.85 | 16.55 % |
|
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