| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1996 | 1.3 | 1.2 | 0.9 | 0.9 | 0.8 | 1 | 0.9 | 0.9 | 0 | 0 | 1.2 | 1 |
| 1997 | 0.9 | 1 | 1.2 | 1.1 | 1 | 0 | 1.3 | 0.8 | 0.8 | 0.9 | 1.1 | 1 |
| 1998 | 0.9 | 0 | 0.9 | 0.9 | 1 | 0.9 | 1.5 | 1.1 | 0.9 | 1 | 1 | 0.8 |
| 1999 | 0.9 | 1.1 | 1.2 | 1.1 | 0.9 | 1.1 | 0.9 | 1.1 | 1 | 0.7 | 1 | −0.5 |
| 2000 | 0 | 0.8 | 1.1 | 0.9 | 0.9 | 1.1 | 0 | 1.1 | 1 | 1 | 1 | 1 |
| 2001 | 0.7 | 0.7 | −0.5 | 1.2 | 0.7 | 1.5 | 1.1 | 0.7 | 0.6 | 1.2 | 1.1 | 1.4 |
| 2002 | 1.3 | 1.1 | 1.2 | 1 | 1 | 0.8 | 1 | 0.7 | 0.7 | 0.9 | 0.9 | 0.9 |
| 2003 | 0 | 0.9 | 1.2 | 1.2 | 1 | 1.3 | 1.3 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 |
| 2004 | 0.8 | 0 | 0.9 | 0.9 | 1.1 | 0.8 | 1 | 1.3 | 1.2 | 1 | 0.8 | 1.1 |
| 2005 | 1 | 0 | 0.9 | 1.2 | 1.4 | 0.9 | 0.9 | 0.9 | 1 | 1.2 | 0.9 | 0.7 |
| 2006 | 0.8 | 0 | 0.9 | 1.2 | 1.4 | 0.9 | 0.9 | 0.9 | 1 | 1.2 | 0.9 | 0.7 |
| 2007 | 0.8 | 0 | 0.9 | 0.9 | 1.1 | 0 | 1 | 1.7 | 0.9 | 0.9 | 0.9 | 0.8 |
| 2008 | 0.9 | 0.9 | 1 | 0.8 | 1.2 | 1.1 | 1.1 | 1 | 0.6 | 1 | 1.2 | 1.2 |
| 2009 | 0.8 | 0.8 | 0.9 | 0.8 | 1.2 | 1.1 | 1 | 1 | 0.6 | 1 | 1.2 | 1.1 |
| 2010 | −0.5 | 4 | 6 | 1.7 | 1.2 | 0.9 | 0.7 | 0.8 | 0.8 | 0 | −0.5 | −0.5 |
| 2011 | 1.6 | 1.4 | 0.8 | 1 | 0.8 | 1.2 | 1 | 0.7 | 0.8 | 1.1 | 0.9 | 0.7 |
| 2012 | 0.9 | 0.9 | 1 | 1.1 | 1.1 | 1 | 0.8 | 0.8 | 0.9 | 1 | 1.1 | 1 |
| 2013 | 0.8 | 0.8 | 0.9 | 0.9 | 0.9 | 0.9 | 1.2 | 1 | 1.1 | 1.1 | 1.2 | 1.2 |
| 2014 | 0.6 | −0.5 | 1.7 | 2.8 | 0.9 | 0.8 | 0.8 | 0 | 0 | 0.7 | 0.6 | 0 |
| 2015 | 0.5 | 0.5 | 0.7 | −0.5 | −0.5 | 0.5 | −0.5 | −0.5 | 2.5 | 1.2 | 1.1 | 0.8 |
| 2016 | 0.9 | 1.1 | 0.9 | 1.4 | 0.8 | 1.1 | 1.1 | 1 | 0.9 | 0.8 | 0.9 | 0 |
| 2017 | 1 | 0.9 | 0.9 | 2 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0 | 0.9 | 0.9 |
| 2018 | 0.9 | 0.9 | 1 | 1.1 | 0.9 | 1 | 0.9 | 1 | 1.3 | 1 | 0.9 | 1 |