HelioTrends: number of authors

The plot below shows the variation of the number of HelioIndex authors with time.

Initial number of authors	1444
Final number of authors	2532
Overall change in author numbers	75.3%
Annualized change in author numbers	12.1%
Growth in last 12 months	6.4%

The plot below shows the percentage change in the number of authors since the first date of the series.

The plot below shows the numbers of authors joining and leaving HelioIndex on each date of the HelioTrends sequence.