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| year | consumption | change |
| 1986 | 1,804.20 | NA |
| 1987 | 1,897.50 | 5.17% |
| 1988 | 1,988.70 | 4.81% |
| 1989 | 2,151.70 | 8.20% |
| 1990 | 2,262.00 | 5.13% |
| 1991 | 2,381.70 | 5.29% |
| 1992 | 2,775.10 | 16.52% |
| 1993 | 2,942.60 | 6.04% |
| 1994 | 3,071.20 | 4.37% |
| 1995 | 3,170.90 | 3.25% |
| 1996 | 3,252.20 | 2.56% |
| 1997 | 3,424.10 | 5.29% |
| 1998 | 3,524.90 | 2.94% |
| 1999 | 3,637.50 | 3.19% |
| 2000 | 3,833.20 | 5.38% |
| 2001 | 3,860.80 | 0.72% |
| 2002 | 3,969.00 | 2.80% |
| 2003 | 4,127.70 | 4.00% |
| 2004 | 4,437.10 | 7.50% |
| 2005 | 4,640.40 | 4.58% |
| 2006 | 4,805.00 | 3.55% |
| 2007 | 4,856.80 | 1.08% |
| 2008 | 4,902.20 | 0.93% |
| 2009 | 5,200.30 | 6.08% |
| 2010 | 5,475.80 | 5.30% |
| 2011 | 5,654.30 | 3.26% |
| 2012 | 5,971.00 | 5.60% |
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