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| year | consumption | change |
| 1980 | 1.58 | NA |
| 1981 | 1.72 | 8.67% |
| 1982 | 1.74 | 1.51% |
| 1983 | 1.68 | -3.73% |
| 1984 | 1.71 | 1.79% |
| 1985 | 1.74 | 1.58% |
| 1986 | 1.88 | 8.29% |
| 1987 | 1.92 | 2.02% |
| 1988 | 1.93 | 0.63% |
| 1989 | 2.07 | 6.99% |
| 1990 | 2.10 | 1.79% |
| 1991 | 2.21 | 5.19% |
| 1992 | 2.22 | 0.32% |
| 1993 | 2.29 | 3.29% |
| 1994 | 2.44 | 6.37% |
| 1995 | 2.47 | 1.35% |
| 1996 | 2.57 | 4.13% |
| 1997 | 2.66 | 3.50% |
| 1998 | 2.86 | 7.55% |
| 1999 | 2.65 | -7.54% |
| 2000 | 2.77 | 4.65% |
| 2001 | 3.03 | 9.42% |
| 2002 | 2.94 | -3.17% |
| 2003 | 2.72 | -7.50% |
| 2004 | 2.93 | 7.92% |
| 2005 | 3.01 | 2.56% |
| 2006 | 3.25 | 7.99% |
| 2007 | 2.93 | -9.71% |
| 2008 | 3.14 | 7.17% |
| 2009 | 3.10 | -1.27% |
| 2010 | 3.01 | -2.77% |
| 2011 | 3.38 | 12.28% |
| 2012 | 3.27 | -3.46% |
| 2013 | 3.36 | 2.75% |
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