| january 2011 - december 2010 |
-0.24 % |
|
january 2011 - january 2010 |
1.74 % |
| february 2011 - january 2011 |
0.47 % |
|
february 2011 - february 2010 |
1.66 % |
| march 2011 - february 2011 |
0.82 % |
|
march 2011 - march 2010 |
1.99 % |
| april 2011 - march 2011 |
0.34 % |
|
april 2011 - april 2010 |
2.08 % |
| may 2011 - april 2011 |
0.05 % |
|
may 2011 - may 2010 |
2.01 % |
| june 2011 - may 2011 |
0.08 % |
|
june 2011 - june 2010 |
2.11 % |
| july 2011 - june 2011 |
-0.44 % |
|
july 2011 - july 2010 |
1.94 % |
| august 2011 - july 2011 |
0.52 % |
|
august 2011 - august 2010 |
2.23 % |
| september 2011 - august 2011 |
-0.07 % |
|
september 2011 - september 2010 |
2.24 % |
| october 2011 - september 2011 |
0.24 % |
|
october 2011 - october 2010 |
2.35 % |
| november 2011 - october 2011 |
0.28 % |
|
november 2011 - november 2010 |
2.52 % |
| december 2011 - november 2011 |
0.40 % |
|
december 2011 - december 2010 |
2.46 % |