|
| year | consumption | change |
| 1980 | 34.00 | NA |
| 1981 | 34.00 | 0.00 % |
| 1982 | 35.00 | 2.94 % |
| 1983 | 36.00 | 2.86 % |
| 1984 | 39.00 | 8.33 % |
| 1985 | 32.82 | -15.85 % |
| 1986 | 31.33 | -4.53 % |
| 1987 | 36.16 | 15.40 % |
| 1988 | 33.98 | -6.03 % |
| 1989 | 31.29 | -7.90 % |
| 1990 | 34.52 | 10.30 % |
| 1991 | 34.27 | -0.72 % |
| 1992 | 36.53 | 6.60 % |
| 1993 | 41.44 | 13.45 % |
| 1994 | 44.66 | 7.76 % |
| 1995 | 47.88 | 7.21 % |
| 1996 | 53.22 | 11.17 % |
| 1997 | 60.10 | 12.93 % |
| 1998 | 61.20 | 1.82 % |
| 1999 | 66.01 | 7.87 % |
| 2000 | 74.60 | 13.01 % |
| 2001 | 73.38 | -1.64 % |
| 2002 | 76.41 | 4.13 % |
| 2003 | 78.27 | 2.43 % |
| 2004 | 80.99 | 3.48 % |
| 2005 | 87.11 | 7.56 % |
| 2006 | 84.39 | -3.13 % |
| 2007 | 87.24 | 3.38 % |
| 2008 | 85.61 | -1.87 % |
| 2009 | 87.00 | 1.63 % |
| 2010 | 81.72 | -6.07 % |
| 2011 | 97.00 | 18.70 % |
|
|