| month | ratio | difference |
| February 2006 | 6,65 | ?? |
| January 2006 | 6,61 | ?? |
| December 2005 | 6,57 | ?? |
| November 2005 | 6.50 | |
| October 2005 | 6,40 | |
| September 2005 | 6.37 | + 0.31 % |
| August 2005 | 6.35 | + 0.79 % |
| July 2005 | 6.30 | + 0.10 % |
| June 2005 | 6.29 | + 0.47% |
| May 2005 | 6.26 | + 0.00% |
| April 2005 | 6.26 | + 0.16% |
| March 2005 | 6.25 | + 0.32% |
| February 2005 | 6.23 | + 0.48% |
| January 2005 | 6.20 | + 0.32 % |
| December 2004 | 6.18 | + 0.48 % |
| November 2004 | 6.15 | +0.32 % |
| October 2004 | 6.13 | +2.16 % |
| September 2004 | 6.00 | +1.35 % |
| August 2004 | 5.92 | + 0.16 % |
| July 2004 | 5.91 | + 0.85 % |
| June 2004 | 5.86 | + 1.91 % |
| May 2004 | 5.75 | + 2.49 % |
| April 2004 | 5.61 | + 2.93 % |
| March 2004 | 5.45 | + 1.67% |
| February 2004 | 5.36 | +3.01 % |
| January 2004 | 5.20 | + 1.16 % |
| December 2003 | 5.14 | + 15.50 % |
| November 2003 | 4.45 | + 6.71 % |
| October 2003 | 4.17 | -- |
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