|
| year | consumption | change |
| 1980 | | NA |
| 1981 | | NA |
| 1982 | | NA |
| 1983 | | NA |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.50 | NA |
| 1987 | 2.40 | -4.00 % |
| 1988 | 4.17 | 73.57 % |
| 1989 | 4.24 | 1.75 % |
| 1990 | 4.40 | 3.70 % |
| 1991 | 4.44 | 1.06 % |
| 1992 | 4.56 | 2.73 % |
| 1993 | 4.65 | 1.97 % |
| 1994 | 4.78 | 2.65 % |
| 1995 | 4.76 | -0.32 % |
| 1996 | 4.77 | 0.15 % |
| 1997 | 4.78 | 0.27 % |
| 1998 | 4.78 | 0.00 % |
| 1999 | 4.78 | 0.00 % |
| 2000 | 4.98 | 4.11 % |
| 2001 | 5.07 | 1.83 % |
| 2002 | 5.30 | 4.55 % |
| 2003 | 5.40 | 1.99 % |
| 2004 | 5.41 | 0.13 % |
| 2005 | 5.43 | 0.25 % |
| 2006 | 5.37 | -1.07 % |
| 2007 | 5.44 | 1.41 % |
| 2008 | 3.33 | -38.83 % |
| 2009 | 5.14 | 54.23 % |
| 2010 | 5.13 | -0.10 % |
| 2011 | | NA |
|
|