|
| year | consumption | change |
| 1980 | 21.00 | NA |
| 1981 | 22.00 | 4.76 % |
| 1982 | 22.00 | 0.00 % |
| 1983 | 21.00 | -4.55 % |
| 1984 | 21.00 | 0.00 % |
| 1985 | 22.00 | 4.76 % |
| 1986 | 24.00 | 9.09 % |
| 1987 | 27.00 | 12.50 % |
| 1988 | 27.00 | 0.00 % |
| 1989 | 30.00 | 11.11 % |
| 1990 | 33.00 | 10.00 % |
| 1991 | 39.00 | 18.18 % |
| 1992 | 40.00 | 2.56 % |
| 1993 | 40.00 | 0.00 % |
| 1994 | 40.00 | 0.00 % |
| 1995 | 37.00 | -7.50 % |
| 1996 | 38.00 | 2.70 % |
| 1997 | 40.00 | 5.26 % |
| 1998 | 42.00 | 5.00 % |
| 1999 | 45.00 | 7.14 % |
| 2000 | 47.55 | 5.67 % |
| 2001 | 50.62 | 6.45 % |
| 2002 | 51.73 | 2.20 % |
| 2003 | 55.51 | 7.30 % |
| 2004 | 62.42 | 12.45 % |
| 2005 | 64.71 | 3.67 % |
| 2006 | 61.44 | -5.06 % |
| 2007 | 60.79 | -1.05 % |
| 2008 | 60.98 | 0.31 % |
| 2009 | 57.15 | -6.28 % |
| 2010 | 59.71 | 4.48 % |
| 2011 | 61.38 | 2.81 % |
|
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