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| year | consumption | change |
| 1980 | 2.00 | NA |
| 1981 | 2.30 | 15.00% |
| 1982 | 2.60 | 13.04% |
| 1983 | 2.80 | 7.69% |
| 1984 | 3.00 | 7.14% |
| 1985 | 3.50 | 16.67% |
| 1986 | 3.80 | 8.57% |
| 1987 | 3.90 | 2.63% |
| 1988 | 3.90 | 0.00% |
| 1989 | 4.10 | 5.13% |
| 1990 | 4.30 | 4.88% |
| 1991 | 4.10 | -4.65% |
| 1992 | 4.60 | 12.20% |
| 1993 | 4.90 | 6.52% |
| 1994 | 5.10 | 4.08% |
| 1995 | 5.20 | 1.96% |
| 1996 | 5.80 | 11.54% |
| 1997 | 6.00 | 3.45% |
| 1998 | 7.10 | 18.33% |
| 1999 | 7.80 | 9.86% |
| 2000 | 8.00 | 2.56% |
| 2001 | 8.70 | 8.75% |
| 2002 | 9.50 | 9.20% |
| 2003 | 10.00 | 5.26% |
| 2004 | 12.00 | 20.00% |
| 2005 | 13.00 | 8.33% |
| 2006 | 15.00 | 15.38% |
| 2007 | 17.00 | 13.33% |
| 2008 | 19.00 | 11.76% |
| 2009 | 21.00 | 10.53% |
| 2010 | 25.00 | 19.05% |
| 2011 | 27.00 | 8.00% |
| 2012 | 31.00 | 14.81% |
| 2013 | 30.00 | -3.23% |
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