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| year | consumption | change |
| 1980 | 14.00 | NA |
| 1981 | 21.00 | 50.00% |
| 1982 | 12.00 | -42.86% |
| 1983 | 15.00 | 25.00% |
| 1984 | 14.00 | -6.67% |
| 1985 | 11.00 | -21.43% |
| 1986 | 14.00 | 27.27% |
| 1987 | 14.00 | 0.00% |
| 1988 | 19.00 | 35.71% |
| 1989 | 26.00 | 36.84% |
| 1990 | 30.00 | 15.38% |
| 1991 | 26.00 | -13.33% |
| 1992 | 32.00 | 23.08% |
| 1993 | 30.00 | -6.25% |
| 1994 | 35.00 | 16.67% |
| 1995 | 43.00 | 22.86% |
| 1996 | 37.00 | -13.95% |
| 1997 | 47.00 | 27.03% |
| 1998 | 31.00 | -34.04% |
| 1999 | 32.00 | 3.23% |
| 2000 | 44.00 | 37.50% |
| 2001 | 29.00 | -34.09% |
| 2002 | 36.00 | 24.14% |
| 2003 | 79.00 | 119.44% |
| 2004 | 76.00 | -3.80% |
| 2005 | 75.00 | -1.32% |
| 2006 | 85.00 | 13.33% |
| 2007 | 89.00 | 4.71% |
| 2008 | 101.00 | 13.48% |
| 2009 | 100.00 | -0.99% |
| 2010 | 96.00 | -4.00% |
| 2011 | 87.00 | -9.38% |
| 2012 | 131.00 | 50.57% |
| 2013 | 113.00 | -13.74% |
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