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 | 32.7 | -3.57% |
| 2011 | 33.9 | -8.38% |
| 2010 | 37.0 | -16.48% |
| 2009 | 44.3 | 9.65% |
| 2008 | 40.4 | 29.07% |
| 2007 | 31.3 | -13.54% |
| 2006 | 36.2 | 19.47% |
| 2005 | 30.3 | -5.02% |
| 2004 | 31.9 | 30.20% |
| 2003 | 24.5 | -17.79% |
| 2002 | 29.8 | 4.20% |
| 2001 | 28.6 |
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