Ozone-depleting substances are any substance containing chlorine or bromine that destroys the stratospheric ozone layer. The stratospheric ozone absorbs most of the biologically damaging ultraviolet radiation.
| Date | Value | Change, % |
|---|---|---|
| 2012 | 9.9 | -6.53% |
| 2011 | 10.6 | -0.38% |
| 2010 | 10.6 | 9.50% |
| 2009 | 9.7 | 8.76% |
| 2008 | 8.9 | 8.54% |
| 2007 | 8.2 | 7.89% |
| 2006 | 7.6 | 8.57% |
| 2005 | 7.0 | 7.69% |
| 2004 | 6.5 | 6.56% |
| 2003 | 6.1 | 7.02% |
| 2002 | 5.7 | 7.55% |
| 2001 | 5.3 |
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