|
| year | consumption | change |
| 1980 | | NA |
| 1981 | 3.50 | NA |
| 1982 | 2.90 | -17.14 % |
| 1983 | 2.40 | -17.24 % |
| 1984 | | NA |
| 1985 | 2.69 | NA |
| 1986 | 2.54 | -5.77 % |
| 1987 | 2.62 | 3.50 % |
| 1988 | | NA |
| 1989 | 3.37 | NA |
| 1990 | 3.52 | 4.45 % |
| 1991 | 4.51 | 28.20 % |
| 1992 | | NA |
| 1993 | 4.27 | NA |
| 1994 | 4.68 | 9.67 % |
| 1995 | 4.90 | 4.70 % |
| 1996 | 4.98 | 1.55 % |
| 1997 | 4.99 | 0.27 % |
| 1998 | 5.03 | 0.84 % |
| 1999 | 5.03 | 0.00 % |
| 2000 | 5.26 | 4.45 % |
| 2001 | 5.35 | 1.76 % |
| 2002 | 5.41 | 1.17 % |
| 2003 | 5.43 | 0.39 % |
| 2004 | 6.26 | 15.28 % |
| 2005 | 6.79 | 8.34 % |
| 2006 | 6.96 | 2.57 % |
| 2007 | 7.19 | 3.27 % |
| 2008 | 7.21 | 0.30 % |
| 2009 | 6.06 | -15.95 % |
| 2010 | 6.06 | 0.00 % |
| 2011 | | NA |
|
|