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| year | consumption | change |
| 1980 | 1.70 | NA |
| 1981 | 1.80 | 5.88% |
| 1982 | 2.10 | 16.67% |
| 1983 | 2.20 | 4.76% |
| 1984 | 2.40 | 9.09% |
| 1985 | 2.50 | 4.17% |
| 1986 | 2.70 | 8.00% |
| 1987 | 2.80 | 3.70% |
| 1988 | 2.90 | 3.57% |
| 1989 | 3.20 | 10.34% |
| 1990 | 3.00 | -6.25% |
| 1991 | 2.80 | -6.67% |
| 1992 | 2.60 | -7.14% |
| 1993 | 2.20 | -15.38% |
| 1994 | 2.20 | 0.00% |
| 1995 | 2.40 | 9.09% |
| 1996 | 2.40 | 0.00% |
| 1997 | 2.30 | -4.17% |
| 1998 | 2.30 | 0.00% |
| 1999 | 2.30 | 0.00% |
| 2000 | 2.40 | 4.35% |
| 2001 | 2.50 | 4.17% |
| 2002 | 2.60 | 4.00% |
| 2003 | 2.70 | 3.85% |
| 2004 | 2.90 | 7.41% |
| 2005 | 3.00 | 3.45% |
| 2006 | 3.20 | 6.67% |
| 2007 | 3.40 | 6.25% |
| 2008 | 3.60 | 5.88% |
| 2009 | 3.60 | 0.00% |
| 2010 | 3.80 | 5.56% |
| 2011 | 3.90 | 2.63% |
| 2012 | 4.20 | 7.69% |
| 2013 | 5.10 | 21.43% |
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