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| year | consumption | change |
| 1986 | 2.30 | NA |
| 1987 | 2.00 | -13.04% |
| 1988 | 3.50 | 75.00% |
| 1989 | 3.00 | -14.29% |
| 1990 | 4.30 | 43.33% |
| 1991 | 4.90 | 13.95% |
| 1992 | 3.80 | -22.45% |
| 1993 | 4.40 | 15.79% |
| 1994 | 2.50 | -43.18% |
| 1995 | 4.40 | 76.00% |
| 1996 | 2.80 | -36.36% |
| 1997 | 6.70 | 139.29% |
| 1998 | 2.90 | -56.72% |
| 1999 | 3.30 | 13.79% |
| 2000 | 2.20 | -33.33% |
| 2001 | 9.00 | 309.09% |
| 2002 | 7.40 | -17.78% |
| 2003 | 8.60 | 16.22% |
| 2004 | 8.50 | -1.16% |
| 2005 | 7.90 | -7.06% |
| 2006 | 16.00 | 102.53% |
| 2007 | 19.00 | 18.75% |
| 2008 | 18.00 | -5.26% |
| 2009 | 8.40 | -53.33% |
| 2010 | 16.00 | 90.48% |
| 2011 | 15.00 | -6.25% |
| 2012 | 16.00 | 6.67% |
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