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| year | consumption | change |
| 1980 | 5.50 | NA |
| 1981 | 5.30 | -3.64% |
| 1982 | 7.70 | 45.28% |
| 1983 | 8.80 | 14.29% |
| 1984 | 9.40 | 6.82% |
| 1985 | 11.00 | 17.02% |
| 1986 | 11.00 | 0.00% |
| 1987 | 12.00 | 9.09% |
| 1988 | 13.00 | 8.33% |
| 1989 | 13.00 | 0.00% |
| 1990 | 15.00 | 15.38% |
| 1991 | 15.00 | 0.00% |
| 1992 | 15.00 | 0.00% |
| 1993 | 15.00 | 0.00% |
| 1994 | 16.00 | 6.67% |
| 1995 | 21.00 | 31.25% |
| 1996 | 23.00 | 9.52% |
| 1997 | 25.00 | 8.70% |
| 1998 | 30.00 | 20.00% |
| 1999 | 34.00 | 13.33% |
| 2000 | 36.00 | 5.88% |
| 2001 | 37.00 | 2.78% |
| 2002 | 41.00 | 10.81% |
| 2003 | 43.00 | 4.88% |
| 2004 | 46.00 | 6.98% |
| 2005 | 53.00 | 15.22% |
| 2006 | 58.00 | 9.43% |
| 2007 | 69.00 | 18.97% |
| 2008 | 71.00 | 2.90% |
| 2009 | 76.00 | 7.04% |
| 2010 | 81.00 | 6.58% |
| 2011 | 86.00 | 6.17% |
| 2012 | 93.00 | 8.14% |
| 2013 | 97.00 | 4.30% |
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