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| year | consumption | change |
| 1986 | 97.00 | NA |
| 1987 | 99.00 | 2.06% |
| 1988 | 88.00 | -11.11% |
| 1989 | 68.00 | -22.73% |
| 1990 | 63.00 | -7.35% |
| 1991 | 65.00 | 3.17% |
| 1992 | 49.00 | -24.62% |
| 1993 | 54.00 | 10.20% |
| 1994 | 43.00 | -20.37% |
| 1995 | 36.00 | -16.28% |
| 1996 | 39.00 | 8.33% |
| 1997 | 51.00 | 30.77% |
| 1998 | 49.00 | -3.92% |
| 1999 | 44.00 | -10.20% |
| 2000 | 37.00 | -15.91% |
| 2001 | 32.00 | -13.51% |
| 2002 | 23.00 | -28.13% |
| 2003 | 30.00 | 30.43% |
| 2004 | 33.00 | 10.00% |
| 2005 | 47.00 | 42.42% |
| 2006 | 49.00 | 4.26% |
| 2007 | 62.00 | 26.53% |
| 2008 | 75.00 | 20.97% |
| 2009 | 60.00 | -20.00% |
| 2010 | 77.00 | 28.33% |
| 2011 | 82.00 | 6.49% |
| 2012 | 93.00 | 13.41% |
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