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| year | consumption | change |
| 1980 | 37.76 | NA |
| 1981 | 39.38 | 4.29% |
| 1982 | 37.40 | -5.04% |
| 1983 | 38.93 | 4.09% |
| 1984 | 41.37 | 6.26% |
| 1985 | 41.28 | -0.20% |
| 1986 | 44.21 | 7.08% |
| 1987 | 46.03 | 4.12% |
| 1988 | 48.96 | 6.38% |
| 1989 | 48.48 | -0.99% |
| 1990 | 49.22 | 1.52% |
| 1991 | 48.35 | -1.77% |
| 1992 | 48.96 | 1.28% |
| 1993 | 53.46 | 9.19% |
| 1994 | 55.08 | 3.03% |
| 1995 | 57.73 | 4.81% |
| 1996 | 62.14 | 7.63% |
| 1997 | 64.77 | 4.24% |
| 1998 | 67.20 | 3.75% |
| 1999 | 72.32 | 7.62% |
| 2000 | 75.95 | 5.02% |
| 2001 | 80.56 | 6.07% |
| 2002 | 83.09 | 3.14% |
| 2003 | 88.52 | 6.53% |
| 2004 | 86.63 | -2.14% |
| 2005 | 94.08 | 8.60% |
| 2006 | 96.59 | 2.67% |
| 2007 | 99.09 | 2.59% |
| 2008 | 93.50 | -5.65% |
| 2009 | 94.40 | 0.97% |
| 2010 | 96.51 | 2.23% |
| 2011 | 98.71 | 2.28% |
| 2012 | 101.61 | 2.94% |
| 2013 | 103.21 | 1.57% |
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