|
| year | consumption | change |
| 1980 | 4,399.33 | NA |
| 1981 | 4,563.57 | 3.73 % |
| 1982 | 4,706.87 | 3.14 % |
| 1983 | 5,202.91 | 10.54 % |
| 1984 | 5,123.54 | -1.53 % |
| 1985 | 5,101.50 | -0.43 % |
| 1986 | 5,202.91 | 1.99 % |
| 1987 | 4,315.55 | -17.06 % |
| 1988 | 5,564.47 | 28.94 % |
| 1989 | 5,173.15 | -7.03 % |
| 1990 | 3,041.53 | -41.21 % |
| 1991 | 5,511.15 | 81.20 % |
| 1992 | 6,179.01 | 12.12 % |
| 1993 | 6,352.98 | 2.82 % |
| 1994 | 6,069.12 | -4.47 % |
| 1995 | 5,046.51 | -16.85 % |
| 1996 | 5,273.13 | 4.49 % |
| 1997 | 5,563.70 | 5.51 % |
| 1998 | 5,675.36 | 2.01 % |
| 1999 | 4,382.24 | -22.78 % |
| 2000 | 4,043.55 | -7.73 % |
| 2001 | 3,581.41 | -11.43 % |
| 2002 | 3,587.58 | 0.17 % |
| 2003 | 4,104.45 | 14.41 % |
| 2004 | 3,217.15 | -21.62 % |
| 2005 | 4,568.89 | 42.02 % |
| 2006 | 4,176.66 | -8.58 % |
| 2007 | 3,288.42 | -21.27 % |
| 2008 | 3,927.54 | 19.44 % |
| 2009 | 5,049.39 | 28.56 % |
| 2010 | 4,968.12 | -1.61 % |
| 2011 | 5,532.06 | 11.35 % |
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