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| year | consumption | change |
| 1986 | 2.30 | NA |
| 1987 | 2.20 | -4.35% |
| 1988 | 2.00 | -9.09% |
| 1989 | 2.00 | 0.00% |
| 1990 | 2.40 | 20.00% |
| 1991 | 2.30 | -4.17% |
| 1992 | 2.20 | -4.35% |
| 1993 | 2.20 | 0.00% |
| 1994 | 2.90 | 31.82% |
| 1995 | 3.20 | 10.34% |
| 1996 | 3.50 | 9.38% |
| 1997 | 3.30 | -5.71% |
| 1998 | 3.20 | -3.03% |
| 1999 | 3.40 | 6.25% |
| 2000 | 4.10 | 20.59% |
| 2001 | 3.50 | -14.63% |
| 2002 | 2.90 | -17.14% |
| 2003 | 3.00 | 3.45% |
| 2004 | 2.80 | -6.67% |
| 2005 | 3.10 | 10.71% |
| 2006 | 2.50 | -19.35% |
| 2007 | 3.20 | 28.00% |
| 2008 | 1.80 | -43.75% |
| 2009 | .00 | -100.00% |
| 2010 | .00 | NA |
| 2011 | .00 | NA |
| 2012 | .00 | NA |
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