| january 2011 - december 2010 |
-0.11 % |
|
january 2011 - january 2010 |
1.85 % |
| february 2011 - january 2011 |
0.75 % |
|
february 2011 - february 2010 |
1.90 % |
| march 2011 - february 2011 |
1.14 % |
|
march 2011 - march 2010 |
1.84 % |
| april 2011 - march 2011 |
0.53 % |
|
april 2011 - april 2010 |
2.04 % |
| may 2011 - april 2011 |
0.07 % |
|
may 2011 - may 2010 |
2.16 % |
| june 2011 - may 2011 |
-0.49 % |
|
june 2011 - june 2010 |
2.15 % |
| july 2011 - june 2011 |
0.50 % |
|
july 2011 - july 2010 |
2.96 % |
| august 2011 - july 2011 |
0.16 % |
|
august 2011 - august 2010 |
2.96 % |
| september 2011 - august 2011 |
0.36 % |
|
september 2011 - september 2010 |
2.69 % |
| october 2011 - september 2011 |
0.04 % |
|
october 2011 - october 2010 |
2.65 % |
| november 2011 - october 2011 |
-0.31 % |
|
november 2011 - november 2010 |
2.46 % |
| december 2011 - november 2011 |
-0.25 % |
|
december 2011 - december 2010 |
2.42 % |