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 | 29.9 | 0.94% |
| 2012 | 29.6 | 0.65% |
| 2011 | 29.5 | 0.20% |
| 2010 | 29.4 | -0.43% |
| 2009 | 29.5 | -1.17% |
| 2008 | 29.9 | -1.92% |
| 2007 | 30.5 | -2.41% |
| 2006 | 31.2 | -2.38% |
| 2005 | 32.0 | -1.71% |
| 2004 | 32.5 | -0.73% |
| 2003 | 32.8 | 0.17% |
| 2002 | 32.7 |
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