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| year | consumption | change |
| 1980 | 19.00 | NA |
| 1981 | 23.00 | 21.05% |
| 1982 | 29.00 | 26.09% |
| 1983 | 32.00 | 10.34% |
| 1984 | 38.00 | 18.75% |
| 1985 | 40.00 | 5.26% |
| 1986 | 47.00 | 17.50% |
| 1987 | 47.00 | 0.00% |
| 1988 | 52.00 | 10.64% |
| 1989 | 57.00 | 9.62% |
| 1990 | 61.00 | 7.02% |
| 1991 | 64.00 | 4.92% |
| 1992 | 68.00 | 6.25% |
| 1993 | 75.00 | 10.29% |
| 1994 | 85.00 | 13.33% |
| 1995 | 92.00 | 8.24% |
| 1996 | 95.00 | 3.26% |
| 1997 | 100.00 | 5.26% |
| 1998 | 108.00 | 8.00% |
| 1999 | 107.00 | -0.93% |
| 2000 | 109.00 | 1.87% |
| 2001 | 118.00 | 8.26% |
| 2002 | 123.00 | 4.24% |
| 2003 | 137.00 | 11.38% |
| 2004 | 137.00 | 0.00% |
| 2005 | 147.00 | 7.30% |
| 2006 | 157.00 | 6.80% |
| 2007 | 163.00 | 3.82% |
| 2008 | 174.00 | 6.75% |
| 2009 | 186.00 | 6.90% |
| 2010 | 204.00 | 9.68% |
| 2011 | 212.00 | 3.92% |
| 2012 | 232.00 | 9.43% |
| 2013 | 247.00 | 6.47% |
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