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| year | consumption | change |
| 1986 | 17.70 | NA |
| 1987 | 19.40 | 9.60 % |
| 1988 | 19.20 | -1.03 % |
| 1989 | 20.70 | 7.81 % |
| 1990 | 20.60 | -0.48 % |
| 1991 | 22.40 | 8.74 % |
| 1992 | 21.10 | -5.80 % |
| 1993 | 22.80 | 8.06 % |
| 1994 | 30.70 | 34.65 % |
| 1995 | 23.80 | -22.48 % |
| 1996 | 35.40 | 48.74 % |
| 1997 | 38.40 | 8.47 % |
| 1998 | 39.60 | 3.12 % |
| 1999 | 45.80 | 15.66 % |
| 2000 | 50.30 | 9.83 % |
| 2001 | 49.30 | -1.99 % |
| 2002 | 49.20 | -0.20 % |
| 2003 | 52.20 | 6.10 % |
| 2004 | 57.90 | 10.92 % |
| 2005 | 59.10 | 2.07 % |
| 2006 | 66.80 | 13.03 % |
| 2007 | 69.20 | 3.59 % |
| 2008 | 72.30 | 4.48 % |
| 2009 | 65.30 | -9.68 % |
| 2010 | 70.20 | 7.50 % |
| 2011 | 65.70 | -6.41 % |
| 2012 | 67.10 | 2.13 % |
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