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| year | consumption | change |
| 1986 | 116.00 | NA |
| 1987 | 124.00 | 6.90% |
| 1988 | 110.00 | -11.29% |
| 1989 | 119.00 | 8.18% |
| 1990 | 120.00 | 0.84% |
| 1991 | 115.00 | -4.17% |
| 1992 | 129.00 | 12.17% |
| 1993 | 138.00 | 6.98% |
| 1994 | 130.00 | -5.80% |
| 1995 | 144.00 | 10.77% |
| 1996 | 151.00 | 4.86% |
| 1997 | 149.00 | -1.32% |
| 1998 | 144.00 | -3.36% |
| 1999 | 138.00 | -4.17% |
| 2000 | 142.00 | 2.90% |
| 2001 | 136.00 | -4.23% |
| 2002 | 147.00 | 8.09% |
| 2003 | 144.00 | -2.04% |
| 2004 | 131.00 | -9.03% |
| 2005 | 118.00 | -9.92% |
| 2006 | 100.00 | -15.25% |
| 2007 | 77.00 | -23.00% |
| 2008 | 65.00 | -15.58% |
| 2009 | 45.00 | -30.77% |
| 2010 | 20.00 | -55.56% |
| 2011 | 19.00 | -5.00% |
| 2012 | 20.00 | 5.26% |
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