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| year | consumption | change |
| 1986 | 1.70 | NA |
| 1987 | 1.60 | -5.88% |
| 1988 | 1.20 | -25.00% |
| 1989 | 1.30 | 8.33% |
| 1990 | 1.40 | 7.69% |
| 1991 | 1.40 | 0.00% |
| 1992 | 1.50 | 7.14% |
| 1993 | 1.60 | 6.67% |
| 1994 | 2.60 | 62.50% |
| 1995 | 1.30 | -50.00% |
| 1996 | 3.10 | 138.46% |
| 1997 | 2.90 | -6.45% |
| 1998 | 2.40 | -17.24% |
| 1999 | 2.50 | 4.17% |
| 2000 | 2.10 | -16.00% |
| 2001 | 2.10 | 0.00% |
| 2002 | 2.30 | 9.52% |
| 2003 | 2.40 | 4.35% |
| 2004 | 2.40 | 0.00% |
| 2005 | 2.40 | 0.00% |
| 2006 | 2.60 | 8.33% |
| 2007 | 3.20 | 23.08% |
| 2008 | 2.70 | -15.63% |
| 2009 | 2.40 | -11.11% |
| 2010 | 2.60 | 8.33% |
| 2011 | 2.70 | 3.85% |
| 2012 | 2.80 | 3.70% |
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