|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 5.12 | NA |
| 1987 | 5.23 | 2.09 % |
| 1988 | 4.80 | -8.14 % |
| 1989 | 4.64 | -3.37 % |
| 1990 | 4.81 | 3.62 % |
| 1991 | 4.28 | -11.02 % |
| 1992 | 5.60 | 30.97 % |
| 1993 | 6.29 | 12.24 % |
| 1994 | 12.43 | 97.77 % |
| 1995 | 6.18 | -50.29 % |
| 1996 | 7.58 | 22.62 % |
| 1997 | 7.90 | 4.29 % |
| 1998 | 9.70 | 22.70 % |
| 1999 | 9.35 | -3.61 % |
| 2000 | 9.09 | -2.77 % |
| 2001 | 9.00 | -0.99 % |
| 2002 | 9.23 | 2.57 % |
| 2003 | 9.42 | 2.03 % |
| 2004 | 10.00 | 6.16 % |
| 2005 | 9.34 | -6.56 % |
| 2006 | 10.00 | 7.06 % |
| 2007 | 10.52 | 5.14 % |
| 2008 | 11.12 | 5.78 % |
| 2009 | 11.54 | 3.78 % |
| 2010 | 10.73 | -7.08 % |
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