|
| year | consumption | change |
| 1980 | | NA |
| 1981 | | NA |
| 1982 | | NA |
| 1983 | 2.15 | NA |
| 1984 | 6.92 | 221.31 % |
| 1985 | 26.84 | 287.76 % |
| 1986 | 45.38 | 69.08 % |
| 1987 | 58.27 | 28.40 % |
| 1988 | 64.31 | 10.36 % |
| 1989 | 68.55 | 6.59 % |
| 1990 | 73.00 | 6.50 % |
| 1991 | 82.00 | 12.33 % |
| 1992 | 86.59 | 5.60 % |
| 1993 | 97.89 | 13.05 % |
| 1994 | 108.03 | 10.35 % |
| 1995 | 127.38 | 17.91 % |
| 1996 | 148.04 | 16.22 % |
| 1997 | 168.10 | 13.55 % |
| 1998 | 172.34 | 2.52 % |
| 1999 | 178.69 | 3.69 % |
| 2000 | 181.87 | 1.78 % |
| 2001 | 180.64 | -0.68 % |
| 2002 | 180.25 | -0.22 % |
| 2003 | 182.90 | 1.47 % |
| 2004 | 182.86 | -0.02 % |
| 2005 | 176.12 | -3.69 % |
| 2006 | 180.11 | 2.27 % |
| 2007 | 161.00 | -10.61 % |
| 2008 | 162.34 | 0.83 % |
| 2009 | 155.74 | -4.07 % |
| 2010 | 176.36 | 13.24 % |
| 2011 | 147.58 | -16.32 % |
|
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