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time series of arctic ice by age
http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=2080
Figure 2. Ice age data show that first-year ice made up 75% of the Arctic sea ice cover this March. Thicker multi-year ice used to make up around a quarter of the Arctic sea ice cover. Now it constitutes only 2%. Image credit: National Snow and Ice Data Center (NSIDC).