|
| year | consumption | change |
| 1980 | 23.15 | NA |
| 1981 | 19.84 | -14.29 % |
| 1982 | 25.35 | 27.78 % |
| 1983 | 19.84 | -21.74 % |
| 1984 | 24.25 | 22.22 % |
| 1985 | 17.64 | -27.27 % |
| 1986 | 16.53 | -6.25 % |
| 1987 | 5.51 | -66.67 % |
| 1988 | 8.82 | 60.00 % |
| 1989 | 17.64 | 100.00 % |
| 1990 | 26.46 | 50.00 % |
| 1991 | 19.84 | -25.00 % |
| 1992 | 22.05 | 11.11 % |
| 1993 | 22.05 | 0.00 % |
| 1994 | 22.05 | 0.00 % |
| 1995 | 22.05 | 0.00 % |
| 1996 | 24.25 | 10.00 % |
| 1997 | 24.25 | 0.00 % |
| 1998 | 22.05 | -9.09 % |
| 1999 | 19.84 | -10.00 % |
| 2000 | 18.74 | -5.56 % |
| 2001 | 16.53 | -11.76 % |
| 2002 | 17.97 | 8.67 % |
| 2003 | 18.19 | 1.23 % |
| 2004 | .22 | -98.79 % |
| 2005 | | NA |
| 2006 | | NA |
| 2007 | | NA |
| 2008 | | NA |
| 2009 | | NA |
| 2010 | | NA |
| 2011 | | NA |
|
|
