| 2010/2009/2008/2007 |
30% PVC |
70% PVC |
| September 2010 |
3.28 |
7.65 |
| August 2010 |
3.30 |
7.69 |
| July 2010 |
3.31 |
7.73 |
| June 2010 |
3.35 |
7.81 |
| May 2010 |
3.36 |
7.85 |
| April 2010 |
3.35 |
7.82 |
| March 2010 |
3.35 |
7.81 |
| February 2010 |
3.36 |
7.84 |
| January 2010 |
3.32 |
7.76 |
| December 2009 |
3.34 |
7.79 |
| November 2009 |
3.33 |
7.76 |
| October 2009 |
3.33 |
7.78 |
| September 2009 |
3.36 |
7.84 |
| August 2009 |
3.35 |
7.82 |
| July 2009 |
3.35 |
7.82 |
| June 2009 |
3.30 |
7.71 |
| May 2009 |
3.28 |
7.65 |
| April 2009 |
3.29 |
7.67 |
| March 2009 |
3.27 |
7.63 |
| February 2009 |
3.23 |
7.53 |
| January 2009 |
3.28 |
7.65 |
| December 2008 |
3.36 |
7.84 |
| November 2008 |
3.36 |
7.83 |
| October 2008 |
3.37 |
7.87 |
| September 2008 |
3.40 |
7.93 |
| August 2008 |
3.40 |
7.94 |
| July 2008 |
3.40 |
7.93 |
| June 2008 |
3.38 |
7.89 |
| May2008 |
3.34 |
7.80 |
| April 2008 |
3.36 |
7.84 |
| March 2008 |
3.36 |
7.84 |
| February 2008 |
3.40 |
7.92 |
| January 2008 |
3.40 |
7.93 |
| December 2007 |
3.44 |
8.03 |
| November 2007 |
3.44 |
8.08 |
| October 2007 |
3.46 |
8.07 |
| September 2007 |
3.49 |
8.15 |
| August 2007 |
3.52 |
8.21 |
| July 2007 |
3.50 |
8.18 |
| June 2007 |
3.48 |
8.11 |
| May 2007 |
3.47 |
8.11 |
| April 2007 |
3.47 |
8.10 |
|