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| year | consumption | change |
| 1980 | 1.61 | NA |
| 1981 | 1.51 | -6.04% |
| 1982 | 1.73 | 14.71% |
| 1983 | 2.12 | 22.24% |
| 1984 | 2.23 | 5.39% |
| 1985 | 2.40 | 7.58% |
| 1986 | 2.43 | 1.25% |
| 1987 | 2.54 | 4.57% |
| 1988 | 2.70 | 6.42% |
| 1989 | 2.97 | 9.99% |
| 1990 | 3.10 | 4.14% |
| 1991 | 3.24 | 4.49% |
| 1992 | 3.35 | 3.52% |
| 1993 | 3.48 | 3.85% |
| 1994 | 3.68 | 5.84% |
| 1995 | 3.82 | 3.83% |
| 1996 | 3.96 | 3.51% |
| 1997 | 4.43 | 11.93% |
| 1998 | 4.58 | 3.50% |
| 1999 | 4.83 | 5.48% |
| 2000 | 5.01 | 3.70% |
| 2001 | 5.39 | 7.42% |
| 2002 | 5.89 | 9.29% |
| 2003 | 6.18 | 4.98% |
| 2004 | 6.39 | 3.45% |
| 2005 | 7.44 | 16.46% |
| 2006 | 7.92 | 6.45% |
| 2007 | 8.13 | 2.57% |
| 2008 | 8.50 | 4.63% |
| 2009 | 9.33 | 9.73% |
| 2010 | 9.19 | -1.54% |
| 2011 | 9.47 | 3.10% |
| 2012 | 9.84 | 3.84% |
| 2013 | 9.87 | 0.36% |
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