|
| year | consumption | change |
| 1980 | 12.00 | NA |
| 1981 | 12.00 | 0.00 % |
| 1982 | 14.00 | 16.67 % |
| 1983 | 14.00 | 0.00 % |
| 1984 | 15.00 | 7.14 % |
| 1985 | 16.45 | 9.64 % |
| 1986 | 16.55 | 0.62 % |
| 1987 | 16.83 | 1.69 % |
| 1988 | 17.28 | 2.68 % |
| 1989 | 16.72 | -3.26 % |
| 1990 | 15.80 | -5.45 % |
| 1991 | 14.69 | -7.07 % |
| 1992 | 13.28 | -9.57 % |
| 1993 | 12.82 | -3.47 % |
| 1994 | 13.10 | 2.17 % |
| 1995 | 11.48 | -12.39 % |
| 1996 | 11.86 | 3.37 % |
| 1997 | 7.99 | -32.68 % |
| 1998 | 8.49 | 6.27 % |
| 1999 | 8.66 | 2.06 % |
| 2000 | 8.50 | -1.92 % |
| 2001 | 9.86 | 16.09 % |
| 2002 | 10.67 | 8.21 % |
| 2003 | 10.35 | -3.03 % |
| 2004 | 12.28 | 18.62 % |
| 2005 | 12.63 | 2.90 % |
| 2006 | 13.88 | 9.90 % |
| 2007 | 15.38 | 10.76 % |
| 2008 | 18.16 | 18.13 % |
| 2009 | 16.53 | -9.02 % |
| 2010 | 17.36 | 5.02 % |
| 2011 | 19.00 | 9.48 % |
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