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| year | consumption | change |
| 1980 | 169.52 | NA |
| 1981 | 179.02 | 5.60% |
| 1982 | 184.44 | 3.03% |
| 1983 | 191.58 | 3.87% |
| 1984 | 208.82 | 9.00% |
| 1985 | 220.45 | 5.57% |
| 1986 | 239.89 | 8.82% |
| 1987 | 248.84 | 3.73% |
| 1988 | 257.25 | 3.38% |
| 1989 | 267.36 | 3.93% |
| 1990 | 276.61 | 3.46% |
| 1991 | 279.32 | 0.98% |
| 1992 | 280.23 | 0.33% |
| 1993 | 290.85 | 3.79% |
| 1994 | 299.17 | 2.86% |
| 1995 | 313.87 | 4.91% |
| 1996 | 321.49 | 2.43% |
| 1997 | 336.09 | 4.54% |
| 1998 | 337.92 | 0.54% |
| 1999 | 350.01 | 3.58% |
| 2000 | 365.67 | 4.48% |
| 2001 | 380.22 | 3.98% |
| 2002 | 403.34 | 6.08% |
| 2003 | 420.27 | 4.20% |
| 2004 | 439.79 | 4.64% |
| 2005 | 466.57 | 6.09% |
| 2006 | 487.75 | 4.54% |
| 2007 | 511.77 | 4.92% |
| 2008 | 518.92 | 1.40% |
| 2009 | 515.12 | -0.73% |
| 2010 | 549.29 | 6.63% |
| 2011 | 573.20 | 4.35% |
| 2012 | 593.11 | 3.47% |
| 2013 | 597.91 | 0.81% |
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