NASA has lots of data on this. You can't contest the satellite imagery.
Two very important Arctic sea ice studies mostly hiding behind headlines: Arctic Summer Sea Ice – Going Down, Down, Down
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The minimum extent of sea ice on the Arctic Ocean in 2016 was reached this week and tied 2007 for the second lowest since satellite measurements began in 1979 — with 2012 still in the top spot.Credit National Snow and Ice Data Center