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so4_a2 contvolc emission 1980

I am trying to run a simulation with MAM7-CAM5 starting from 1980. However for the so4_a2 contvolc emissions I had download the file from SVN repository:
However this file doesn't have the year 1980, in fact only have times for 1750, 1850 and then 2000.
From where or how I can obtain the emissions from contvolc for the year 1980 for so4_a2 and also so4_a1 (i.e. for the aitken and accumulation mode?)
I really appreciate your help!