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2005 is the year when Hurricane Katrina hit the Gulf coast region including Louisiana. 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 others is from NOAA (National Oceanic and Atmospheric Administration) https://www.ncdc.noaa.gov/ibtracs/index.php?name=ibtracs-data