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| year | consumption | change |
| 1980 | 160.00 | NA |
| 1981 | 165.00 | 3.13% |
| 1982 | 180.00 | 9.09% |
| 1983 | 192.00 | 6.67% |
| 1984 | 194.00 | 1.04% |
| 1985 | 194.00 | 0.00% |
| 1986 | 192.00 | -1.03% |
| 1987 | 197.00 | 2.60% |
| 1988 | 202.00 | 2.54% |
| 1989 | 220.00 | 8.91% |
| 1990 | 266.00 | 20.91% |
| 1991 | 282.00 | 6.02% |
| 1992 | 302.00 | 7.09% |
| 1993 | 336.00 | 11.26% |
| 1994 | 378.00 | 12.50% |
| 1995 | 399.00 | 5.56% |
| 1996 | 435.00 | 9.02% |
| 1997 | 469.00 | 7.82% |
| 1998 | 449.00 | -4.26% |
| 1999 | 454.00 | 1.11% |
| 2000 | 465.00 | 2.42% |
| 2001 | 475.00 | 2.15% |
| 2002 | 463.00 | -2.53% |
| 2003 | 480.00 | 3.67% |
| 2004 | 508.00 | 5.83% |
| 2005 | 522.00 | 2.76% |
| 2006 | 534.00 | 2.30% |
| 2007 | 574.00 | 7.49% |
| 2008 | 568.00 | -1.05% |
| 2009 | 611.00 | 7.57% |
| 2010 | 631.00 | 3.27% |
| 2011 | 675.00 | 6.97% |
| 2012 | 670.00 | -0.74% |
| 2013 | 680.00 | 1.49% |
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