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| year | consumption | change |
| 1980 | 4.01 | NA |
| 1981 | 3.88 | -3.19% |
| 1982 | 3.94 | 1.42% |
| 1983 | 3.94 | 0.00% |
| 1984 | 4.31 | 9.37% |
| 1985 | 4.59 | 6.62% |
| 1986 | 4.97 | 8.23% |
| 1987 | 5.10 | 2.60% |
| 1988 | 5.26 | 3.20% |
| 1989 | 5.42 | 3.08% |
| 1990 | 5.76 | 6.10% |
| 1991 | 5.97 | 3.81% |
| 1992 | 6.06 | 1.36% |
| 1993 | 6.30 | 3.98% |
| 1994 | 6.59 | 4.67% |
| 1995 | 6.99 | 6.01% |
| 1996 | 7.42 | 6.21% |
| 1997 | 7.82 | 5.42% |
| 1998 | 8.08 | 3.31% |
| 1999 | 8.23 | 1.89% |
| 2000 | 8.50 | 3.23% |
| 2001 | 8.42 | -1.00% |
| 2002 | 8.51 | 1.08% |
| 2003 | 8.59 | 0.94% |
| 2004 | 8.95 | 4.24% |
| 2005 | 9.25 | 3.32% |
| 2006 | 9.47 | 2.43% |
| 2007 | 9.98 | 5.41% |
| 2008 | 10.45 | 4.65% |
| 2009 | 10.39 | -0.58% |
| 2010 | 11.43 | 10.00% |
| 2011 | 11.89 | 4.06% |
| 2012 | 12.27 | 3.22% |
| 2013 | 12.57 | 2.43% |
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