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| year | consumption | change |
| 1986 | 25.00 | NA |
| 1987 | 26.00 | 4.00% |
| 1988 | 29.00 | 11.54% |
| 1989 | 31.00 | 6.90% |
| 1990 | 32.00 | 3.23% |
| 1991 | 34.00 | 6.25% |
| 1992 | 37.00 | 8.82% |
| 1993 | 39.00 | 5.41% |
| 1994 | 44.00 | 12.82% |
| 1995 | 47.00 | 6.82% |
| 1996 | 51.00 | 8.51% |
| 1997 | 53.00 | 3.92% |
| 1998 | 55.00 | 3.77% |
| 1999 | 56.00 | 1.82% |
| 2000 | 56.00 | 0.00% |
| 2001 | 51.00 | -8.93% |
| 2002 | 51.00 | 0.00% |
| 2003 | 50.00 | -1.96% |
| 2004 | 50.00 | 0.00% |
| 2005 | 50.00 | 0.00% |
| 2006 | 49.00 | -2.00% |
| 2007 | 53.00 | 8.16% |
| 2008 | 54.00 | 1.89% |
| 2009 | 59.00 | 9.26% |
| 2010 | 65.00 | 10.17% |
| 2011 | 61.00 | -6.15% |
| 2012 | 62.00 | 1.64% |
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