|
| year | consumption | change |
| 1980 | 16.00 | NA |
| 1981 | 16.00 | 0.00 % |
| 1982 | 15.00 | -6.25 % |
| 1983 | 16.00 | 6.67 % |
| 1984 | 13.84 | -13.51 % |
| 1985 | 14.73 | 6.41 % |
| 1986 | 13.44 | -8.73 % |
| 1987 | 15.74 | 17.14 % |
| 1988 | 18.05 | 14.62 % |
| 1989 | 19.56 | 8.38 % |
| 1990 | 18.75 | -4.13 % |
| 1991 | 19.94 | 6.33 % |
| 1992 | 24.85 | 24.63 % |
| 1993 | 27.03 | 8.76 % |
| 1994 | 28.06 | 3.84 % |
| 1995 | 31.27 | 11.42 % |
| 1996 | 30.08 | -3.81 % |
| 1997 | 31.01 | 3.10 % |
| 1998 | 34.97 | 12.76 % |
| 1999 | 35.75 | 2.23 % |
| 2000 | 36.28 | 1.50 % |
| 2001 | 37.59 | 3.60 % |
| 2002 | 39.66 | 5.53 % |
| 2003 | 41.92 | 5.70 % |
| 2004 | 41.56 | -0.86 % |
| 2005 | 40.61 | -2.29 % |
| 2006 | 45.72 | 12.59 % |
| 2007 | 48.63 | 6.36 % |
| 2008 | 49.63 | 2.06 % |
| 2009 | 47.59 | -4.11 % |
| 2010 | 48.67 | 2.26 % |
| 2011 | 47.00 | -3.43 % |
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