3174 20170616095752.0 DATASET-2017-0021 Clette, F. International Sunspot Number 2016 Total, North, South, daily, monthly mean, monthly smoothed, yearly mean sunspot number time series (1700 to present) World Data Center SILSO, Sunspot Index and Long-term Solar Observations , 1 - 12/2016 STCE olivier.lemaitre@observatoire.be http://www.sidc.be/silso/datafiles DATASET