| Premium | Mid-priced | Economy |
---|---|---|---|
2005–2006 | 0.043 | 0.038 | 0.047 |
2006–2007 | −0.012 | 0.005 | 0.004 |
2007–2008 | −0.043 | −0.017 | −0.003 |
2008–2009 | 0.020 | 0.012 | 0.047 |
2009–2010 | 0.004 | 0.019 | 0.035 |
2010–2011 | −0.125 | −0.093 | −0.072 |
2011–2012 | 0.030 | 0.039 | 0.043 |