Annual data series are interpolated from 5-year period data. Therefore they may not reflect real events as much as observed data.
| Date | Value | Change, % |
|---|---|---|
| 2013 | 51.9 | 0.05% |
| 2012 | 51.8 | 0.04% |
| 2011 | 51.8 | 0.01% |
| 2010 | 51.8 | -0.02% |
| 2009 | 51.8 | -0.04% |
| 2008 | 51.8 | -0.06% |
| 2007 | 51.9 | -0.07% |
| 2006 | 51.9 | -0.07% |
| 2005 | 51.9 | -0.08% |
| 2004 | 52.0 | -0.08% |
| 2003 | 52.0 | -0.06% |
| 2002 | 52.0 |
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