|
| year | consumption | change |
| 1980 | 317.47 | NA |
| 1981 | 324.08 | 2.08 % |
| 1982 | 267.86 | -17.35 % |
| 1983 | 199.52 | -25.51 % |
| 1984 | 137.79 | -30.94 % |
| 1985 | 116.85 | -15.20 % |
| 1986 | 112.44 | -3.77 % |
| 1987 | 69.45 | -38.24 % |
| 1988 | 71.65 | 3.17 % |
| 1989 | 70.55 | -1.54 % |
| 1990 | 63.93 | -9.38 % |
| 1991 | 68.34 | 6.90 % |
| 1992 | 66.14 | -3.23 % |
| 1993 | 66.14 | 0.00 % |
| 1994 | 66.14 | 0.00 % |
| 1995 | 61.73 | -6.67 % |
| 1996 | | NA |
| 1997 | | NA |
| 1998 | | NA |
| 1999 | | NA |
| 2000 | | NA |
| 2001 | | NA |
| 2002 | | NA |
| 2003 | | NA |
| 2004 | | NA |
| 2005 | | NA |
| 2006 | | NA |
| 2007 | 9.92 | NA |
| 2008 | 11.02 | 11.11 % |
| 2009 | 11.02 | 0.00 % |
| 2010 | 11.02 | 0.00 % |
| 2011 | 36.38 | 230.00 % |
|
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