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| year | consumption | change |
| 1986 | 29.00 | NA |
| 1987 | 28.00 | -3.45% |
| 1988 | 29.00 | 3.57% |
| 1989 | 29.00 | 0.00% |
| 1990 | 31.00 | 6.90% |
| 1991 | 32.00 | 3.23% |
| 1992 | 34.00 | 6.25% |
| 1993 | 31.00 | -8.82% |
| 1994 | 30.00 | -3.23% |
| 1995 | 29.00 | -3.33% |
| 1996 | 31.00 | 6.90% |
| 1997 | 32.00 | 3.23% |
| 1998 | 33.00 | 3.13% |
| 1999 | 30.00 | -9.09% |
| 2000 | 34.00 | 13.33% |
| 2001 | 35.00 | 2.94% |
| 2002 | 41.00 | 17.14% |
| 2003 | 42.00 | 2.44% |
| 2004 | 38.00 | -9.52% |
| 2005 | 39.00 | 2.63% |
| 2006 | 46.00 | 17.95% |
| 2007 | 47.00 | 2.17% |
| 2008 | 63.00 | 34.04% |
| 2009 | 40.00 | -36.51% |
| 2010 | 59.00 | 47.50% |
| 2011 | 64.00 | 8.47% |
| 2012 | 65.00 | 1.56% |
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