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| year | consumption | change |
| 1980 | 1.30 | NA |
| 1981 | 1.70 | 30.77% |
| 1982 | 2.00 | 17.65% |
| 1983 | 2.00 | 0.00% |
| 1984 | 2.00 | 0.00% |
| 1985 | 2.20 | 10.00% |
| 1986 | 2.00 | -9.09% |
| 1987 | 2.10 | 5.00% |
| 1988 | 2.30 | 9.52% |
| 1989 | 2.40 | 4.35% |
| 1990 | 2.30 | -4.17% |
| 1991 | 2.30 | 0.00% |
| 1992 | 2.30 | 0.00% |
| 1993 | 2.30 | 0.00% |
| 1994 | 2.20 | -4.35% |
| 1995 | 2.20 | 0.00% |
| 1996 | 2.30 | 4.55% |
| 1997 | 2.50 | 8.70% |
| 1998 | 2.50 | 0.00% |
| 1999 | 2.60 | 4.00% |
| 2000 | 2.70 | 3.85% |
| 2001 | 2.60 | -3.70% |
| 2002 | 2.50 | -3.85% |
| 2003 | 2.80 | 12.00% |
| 2004 | 3.30 | 17.86% |
| 2005 | 3.30 | 0.00% |
| 2006 | 4.40 | 33.33% |
| 2007 | 4.60 | 4.55% |
| 2008 | 5.00 | 8.70% |
| 2009 | 5.10 | 2.00% |
| 2010 | 5.20 | 1.96% |
| 2011 | 5.20 | 0.00% |
| 2012 | 5.50 | 5.77% |
| 2013 | 6.00 | 9.09% |
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