|
| year | consumption | change |
| 1980 | 777.57 | NA |
| 1981 | 697.54 | -10.29 % |
| 1982 | 579.26 | -16.96 % |
| 1983 | 731.05 | 26.20 % |
| 1984 | 691.15 | -5.46 % |
| 1985 | 1,297.42 | 87.72 % |
| 1986 | 2,478.99 | 91.07 % |
| 1987 | 3,184.14 | 28.45 % |
| 1988 | 3,712.36 | 16.59 % |
| 1989 | 4,528.30 | 21.98 % |
| 1990 | 4,857.89 | 7.28 % |
| 1991 | 5,094.29 | 4.87 % |
| 1992 | 5,196.19 | 2.00 % |
| 1993 | 5,490.61 | 5.67 % |
| 1994 | 5,776.11 | 5.20 % |
| 1995 | 6,253.41 | 8.26 % |
| 1996 | 5,994.37 | -4.14 % |
| 1997 | 6,046.18 | 0.86 % |
| 1998 | 5,495.02 | -9.12 % |
| 1999 | 6,705.36 | 22.03 % |
| 2000 | 6,730.71 | 0.38 % |
| 2001 | 5,685.72 | -15.53 % |
| 2002 | 6,271.05 | 10.29 % |
| 2003 | 5,921.62 | -5.57 % |
| 2004 | 6,086.96 | 2.79 % |
| 2005 | 6,041.77 | -0.74 % |
| 2006 | 6,030.75 | -0.18 % |
| 2007 | 5,231.57 | -13.25 % |
| 2008 | 4,585.62 | -12.35 % |
| 2009 | 5,158.82 | 12.50 % |
| 2010 | 2,981.75 | -42.20 % |
| 2011 | 4,076.35 | 36.71 % |
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