|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 20.89 | NA |
| 1987 | 20.03 | -4.12 % |
| 1988 | 21.04 | 5.03 % |
| 1989 | 23.69 | 12.59 % |
| 1990 | 25.26 | 6.62 % |
| 1991 | 27.56 | 9.12 % |
| 1992 | 33.05 | 19.91 % |
| 1993 | 32.34 | -2.14 % |
| 1994 | 32.03 | -0.95 % |
| 1995 | 33.44 | 4.41 % |
| 1996 | 40.73 | 21.77 % |
| 1997 | 39.51 | -2.98 % |
| 1998 | 39.13 | -0.96 % |
| 1999 | 52.90 | 35.17 % |
| 2000 | 55.55 | 5.01 % |
| 2001 | 61.18 | 10.13 % |
| 2002 | 51.70 | -15.48 % |
| 2003 | 60.05 | 16.14 % |
| 2004 | 56.51 | -5.89 % |
| 2005 | 53.60 | -5.16 % |
| 2006 | 58.93 | 9.96 % |
| 2007 | 67.34 | 14.27 % |
| 2008 | 62.40 | -7.34 % |
| 2009 | 52.43 | -15.98 % |
| 2010 | 60.29 | 14.99 % |
|
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