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2012 is the year when Hurricane Sandy hit East Coast region including New Jersey. The size is the wind speed.
The data for Irma is from Weather Underground: https://www.wunderground.com/hurricane/atlantic/2017/hurricane-irma
The data for the other hurricanes is from NOAA (National Oceanic and Atmospheric Administration) https://www.ncdc.noaa.gov/ibtracs/index.php?name=ibtracs-data