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| year | consumption | change |
| 1986 | 31.00 | NA |
| 1987 | 29.00 | -6.45% |
| 1988 | 30.00 | 3.45% |
| 1989 | 32.00 | 6.67% |
| 1990 | 34.00 | 6.25% |
| 1991 | 36.00 | 5.88% |
| 1992 | 38.00 | 5.56% |
| 1993 | 39.00 | 2.63% |
| 1994 | 43.00 | 10.26% |
| 1995 | 44.00 | 2.33% |
| 1996 | 47.00 | 6.82% |
| 1997 | 49.00 | 4.26% |
| 1998 | 55.00 | 12.24% |
| 1999 | 61.00 | 10.91% |
| 2000 | 64.00 | 4.92% |
| 2001 | 66.00 | 3.13% |
| 2002 | 67.00 | 1.52% |
| 2003 | 68.00 | 1.49% |
| 2004 | 70.00 | 2.94% |
| 2005 | 75.00 | 7.14% |
| 2006 | 78.00 | 4.00% |
| 2007 | 81.00 | 3.85% |
| 2008 | 80.00 | -1.23% |
| 2009 | 72.00 | -10.00% |
| 2010 | 69.00 | -4.17% |
| 2011 | 64.00 | -7.25% |
| 2012 | 64.00 | 0.00% |
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