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K4fmh's interactive graph and data of "ARRL Year-End Membership By Year, 2001-2021" is a line chart, showing Number; with Year in the x-axis and Number of ARRL Members in the y-axis.. The x-axis shows values from 2001 to 2021. The y-axis shows values from 147372.48350201212 to 172742.81346176978. This visualization has the following annotations: Rapid peak and sudden decline; Lowest membership over period; Net change from 2001 to 2021 is -2,414 members