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| year | consumption | change |
| 1986 | 75.00 | NA |
| 1987 | 77.00 | 2.67% |
| 1988 | 80.00 | 3.90% |
| 1989 | 82.00 | 2.50% |
| 1990 | 86.00 | 4.88% |
| 1991 | 89.00 | 3.49% |
| 1992 | 92.00 | 3.37% |
| 1993 | 86.00 | -6.52% |
| 1994 | 86.00 | 0.00% |
| 1995 | 83.00 | -3.49% |
| 1996 | 85.00 | 2.41% |
| 1997 | 89.00 | 4.71% |
| 1998 | 89.00 | 0.00% |
| 1999 | 92.00 | 3.37% |
| 2000 | 92.00 | 0.00% |
| 2001 | 90.00 | -2.17% |
| 2002 | 88.00 | -2.22% |
| 2003 | 87.00 | -1.14% |
| 2004 | 86.00 | -1.15% |
| 2005 | 83.00 | -3.49% |
| 2006 | 81.00 | -2.41% |
| 2007 | 80.00 | -1.23% |
| 2008 | 78.00 | -2.50% |
| 2009 | 76.00 | -2.56% |
| 2010 | 73.00 | -3.95% |
| 2011 | 70.00 | -4.11% |
| 2012 | 68.00 | -2.86% |
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