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| year | consumption | change |
| 1980 | 45.00 | NA |
| 1981 | 42.00 | -6.67% |
| 1982 | 41.00 | -2.38% |
| 1983 | 43.00 | 4.88% |
| 1984 | 41.00 | -4.65% |
| 1985 | 48.00 | 17.07% |
| 1986 | 46.00 | -4.17% |
| 1987 | 48.00 | 4.35% |
| 1988 | 43.00 | -10.42% |
| 1989 | 35.00 | -18.60% |
| 1990 | 33.00 | -5.71% |
| 1991 | 53.00 | 60.61% |
| 1992 | 55.00 | 3.77% |
| 1993 | 67.00 | 21.82% |
| 1994 | 76.00 | 13.43% |
| 1995 | 82.00 | 7.89% |
| 1996 | 85.00 | 3.66% |
| 1997 | 97.00 | 14.12% |
| 1998 | 100.00 | 3.09% |
| 1999 | 104.00 | 4.00% |
| 2000 | 106.00 | 1.92% |
| 2001 | 101.00 | -4.72% |
| 2002 | 102.00 | 0.99% |
| 2003 | 104.00 | 1.96% |
| 2004 | 102.00 | -1.92% |
| 2005 | 97.00 | -4.90% |
| 2006 | 87.00 | -10.31% |
| 2007 | 79.00 | -9.20% |
| 2008 | 103.00 | 30.38% |
| 2009 | 129.00 | 25.24% |
| 2010 | 120.00 | -6.98% |
| 2011 | 124.00 | 3.33% |
| 2012 | 127.00 | 2.42% |
| 2013 | 125.00 | -1.57% |
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