Here are the charts from NetMarketShare and StatCounter.
NetMarketShare suggests that W7 & W10 are flat.
StatCounter shows a big increase for W10increasingand corresponding decrease for W7.(You'll need to click several times to see it full size)
Data from NetMarketShare
Data from StatCounter
Note:
If you visit the NetMarketShare site, you'll notice that the info listed in the table does not match the data points on the graph.
The StatCounter graph shows the share of Windows versions out of the total Windows market share (Android has the largest OS market share).