|
| year | consumption | change |
| 1980 | 1.10 | NA |
| 1981 | 2.20 | 100.00 % |
| 1982 | 1.10 | -50.00 % |
| 1983 | 15.43 | 1,300.00 % |
| 1984 | 26.46 | 71.43 % |
| 1985 | 39.68 | 50.00 % |
| 1986 | 50.71 | 27.78 % |
| 1987 | 41.89 | -17.39 % |
| 1988 | 45.19 | 7.89 % |
| 1989 | 82.67 | 82.93 % |
| 1990 | 82.67 | 0.00 % |
| 1991 | 72.75 | -12.00 % |
| 1992 | 79.37 | 9.09 % |
| 1993 | 69.45 | -12.50 % |
| 1994 | 38.58 | -44.44 % |
| 1995 | 69.45 | 80.00 % |
| 1996 | 45.19 | -34.92 % |
| 1997 | 49.60 | 9.76 % |
| 1998 | 78.26 | 57.78 % |
| 1999 | 149.91 | 91.55 % |
| 2000 | 279.33 | 86.32 % |
| 2001 | 329.04 | 17.80 % |
| 2002 | 345.02 | 4.86 % |
| 2003 | 348.77 | 1.09 % |
| 2004 | 318.35 | -8.72 % |
| 2005 | 401.24 | 26.04 % |
| 2006 | 534.62 | 33.24 % |
| 2007 | 631.62 | 18.14 % |
| 2008 | 718.71 | 13.79 % |
| 2009 | 656.98 | -8.59 % |
| 2010 | 736.34 | 12.08 % |
| 2011 | 728.63 | -1.05 % |
|
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