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| year | consumption | change |
| 1980 | 1.10 | NA |
| 1981 | 1.10 | 0.00% |
| 1982 | 1.10 | 0.00% |
| 1983 | 1.10 | 0.00% |
| 1984 | 1.10 | 0.00% |
| 1985 | 1.10 | 0.00% |
| 1986 | 1.10 | 0.00% |
| 1987 | 1.10 | 0.00% |
| 1988 | 1.10 | 0.00% |
| 1989 | 1.20 | 9.09% |
| 1990 | 1.40 | 16.67% |
| 1991 | 1.50 | 7.14% |
| 1992 | 1.40 | -6.67% |
| 1993 | 1.40 | 0.00% |
| 1994 | 1.30 | -7.14% |
| 1995 | 1.60 | 23.08% |
| 1996 | 1.80 | 12.50% |
| 1997 | 1.60 | -11.11% |
| 1998 | 2.20 | 37.50% |
| 1999 | 1.80 | -18.18% |
| 2000 | 1.90 | 5.56% |
| 2001 | 2.10 | 10.53% |
| 2002 | 2.20 | 4.76% |
| 2003 | 2.00 | -9.09% |
| 2004 | 2.40 | 20.00% |
| 2005 | 2.50 | 4.17% |
| 2006 | 2.60 | 4.00% |
| 2007 | 3.30 | 26.92% |
| 2008 | 3.50 | 6.06% |
| 2009 | 3.00 | -14.29% |
| 2010 | 4.10 | 36.67% |
| 2011 | 3.80 | -7.32% |
| 2012 | 4.30 | 13.16% |
| 2013 | 4.20 | -2.33% |
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