|
| year | consumption | change |
| 1984 | 54.19 | NA |
| 1985 | 49.01 | -9.55 % |
| 1986 | 50.20 | 2.42 % |
| 1987 | 48.28 | -3.83 % |
| 1988 | 39.16 | -18.89 % |
| 1989 | 35.44 | -9.49 % |
| 1990 | 39.51 | 11.47 % |
| 1991 | 39.29 | -0.55 % |
| 1992 | 34.26 | -12.80 % |
| 1993 | 37.28 | 8.83 % |
| 1994 | 34.63 | -7.13 % |
| 1995 | 33.50 | -3.25 % |
| 1996 | 32.15 | -4.02 % |
| 1997 | 34.22 | 6.43 % |
| 1998 | 34.67 | 1.30 % |
| 1999 | 28.41 | -18.05 % |
| 2000 | 23.52 | -17.21 % |
| 2001 | 26.28 | 11.76 % |
| 2002 | 19.27 | -26.70 % |
| 2003 | 22.25 | 15.47 % |
| 2004 | 20.84 | -6.32 % |
| 2005 | 19.29 | -7.44 % |
| 2006 | 19.34 | 0.26 % |
| 2007 | 16.13 | -16.57 % |
| 2008 | 14.36 | -11.03 % |
| 2009 | 13.30 | -7.36 % |
| 2010 | 16.35 | 22.91 % |
|
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