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| year | consumption | change |
| 1980 | 522.00 | NA |
| 1981 | 481.00 | -7.85% |
| 1982 | 445.00 | -7.48% |
| 1983 | 407.00 | -8.54% |
| 1984 | 385.00 | -5.41% |
| 1985 | 405.00 | 5.19% |
| 1986 | 454.00 | 12.10% |
| 1987 | 457.00 | 0.66% |
| 1988 | 470.00 | 2.84% |
| 1989 | 462.00 | -1.70% |
| 1990 | 463.00 | 0.22% |
| 1991 | 497.00 | 7.34% |
| 1992 | 509.00 | 2.41% |
| 1993 | 500.00 | -1.77% |
| 1994 | 553.00 | 10.60% |
| 1995 | 550.00 | -0.54% |
| 1996 | 593.00 | 7.82% |
| 1997 | 611.00 | 3.04% |
| 1998 | 622.00 | 1.80% |
| 1999 | 593.00 | -4.66% |
| 2000 | 606.00 | 2.19% |
| 2001 | 609.00 | 0.50% |
| 2002 | 617.00 | 1.31% |
| 2003 | 655.00 | 6.16% |
| 2004 | 657.00 | 0.31% |
| 2005 | 664.00 | 1.07% |
| 2006 | 642.00 | -3.31% |
| 2007 | 649.00 | 1.09% |
| 2008 | 702.00 | 8.17% |
| 2009 | 638.00 | -9.12% |
| 2010 | 669.00 | 4.86% |
| 2011 | 629.00 | -5.98% |
| 2012 | 607.00 | -3.50% |
| 2013 | 629.00 | 3.62% |
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