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| year | consumption | change |
| 1980 | 17.94 | NA |
| 1981 | 17.78 | -0.90% |
| 1982 | 18.39 | 3.43% |
| 1983 | 19.52 | 6.16% |
| 1984 | 20.98 | 7.47% |
| 1985 | 22.01 | 4.93% |
| 1986 | 22.81 | 3.60% |
| 1987 | 24.13 | 5.79% |
| 1988 | 25.79 | 6.88% |
| 1989 | 25.81 | 0.10% |
| 1990 | 28.29 | 9.61% |
| 1991 | 26.39 | -6.73% |
| 1992 | 27.47 | 4.09% |
| 1993 | 29.59 | 7.74% |
| 1994 | 31.88 | 7.73% |
| 1995 | 34.44 | 8.03% |
| 1996 | 35.75 | 3.81% |
| 1997 | 34.85 | -2.52% |
| 1998 | 35.32 | 1.36% |
| 1999 | 37.00 | 4.75% |
| 2000 | 41.11 | 11.11% |
| 2001 | 43.51 | 5.84% |
| 2002 | 47.12 | 8.29% |
| 2003 | 54.33 | 15.30% |
| 2004 | 63.45 | 16.78% |
| 2005 | 72.65 | 14.51% |
| 2006 | 79.36 | 9.23% |
| 2007 | 85.97 | 8.32% |
| 2008 | 88.89 | 3.40% |
| 2009 | 93.63 | 5.33% |
| 2010 | 99.73 | 6.52% |
| 2011 | 108.24 | 8.53% |
| 2012 | 113.04 | 4.44% |
| 2013 | 116.72 | 3.25% |
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