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| year | consumption | change |
| 1986 | 4.60 | NA |
| 1987 | 4.80 | 4.35% |
| 1988 | 5.40 | 12.50% |
| 1989 | 5.40 | 0.00% |
| 1990 | 5.90 | 9.26% |
| 1991 | 6.30 | 6.78% |
| 1992 | 6.50 | 3.17% |
| 1993 | 6.60 | 1.54% |
| 1994 | 8.50 | 28.79% |
| 1995 | 8.70 | 2.35% |
| 1996 | 8.90 | 2.30% |
| 1997 | 9.00 | 1.12% |
| 1998 | 9.50 | 5.56% |
| 1999 | 11.00 | 15.79% |
| 2000 | 22.00 | 100.00% |
| 2001 | 14.00 | -36.36% |
| 2002 | 14.00 | 0.00% |
| 2003 | 16.00 | 14.29% |
| 2004 | 13.00 | -18.75% |
| 2005 | 13.00 | 0.00% |
| 2006 | 23.00 | 76.92% |
| 2007 | 26.00 | 13.04% |
| 2008 | 29.00 | 11.54% |
| 2009 | 32.00 | 10.34% |
| 2010 | 36.00 | 12.50% |
| 2011 | 40.00 | 11.11% |
| 2012 | 44.00 | 10.00% |
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