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| year | consumption | change |
| 1986 | 22.00 | NA |
| 1987 | 24.00 | 9.09% |
| 1988 | 27.00 | 12.50% |
| 1989 | 29.00 | 7.41% |
| 1990 | 32.00 | 10.34% |
| 1991 | 35.00 | 9.38% |
| 1992 | 39.00 | 11.43% |
| 1993 | 42.00 | 7.69% |
| 1994 | 43.00 | 2.38% |
| 1995 | 44.00 | 2.33% |
| 1996 | 45.00 | 2.27% |
| 1997 | 45.00 | 0.00% |
| 1998 | 47.00 | 4.44% |
| 1999 | 48.00 | 2.13% |
| 2000 | 49.00 | 2.08% |
| 2001 | 46.00 | -6.12% |
| 2002 | 48.00 | 4.35% |
| 2003 | 46.00 | -4.17% |
| 2004 | 44.00 | -4.35% |
| 2005 | 42.00 | -4.55% |
| 2006 | 39.00 | -7.14% |
| 2007 | 37.00 | -5.13% |
| 2008 | 34.00 | -8.11% |
| 2009 | 34.00 | 0.00% |
| 2010 | 32.00 | -5.88% |
| 2011 | 29.00 | -9.38% |
| 2012 | 26.00 | -10.34% |
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