Having lost the title of top wearables maker to Apple (NASDAQ: AAPL) last year, Fitbit's (NYSE: FIT) decline is now accelerating and will only get worse from here.According to IDC's latest market share figures, Apple's share grew to 17% in the second quarter from 13% last year, while Fitbit's fell from 12.8% to 9.5%.This was the quarter in which Fitbit launched its Versa smartwatch as the wearables maker seeks to pivot from simple trackers to more advanced devices, and the drop in market share could get worse as Apple just announced its latest Apple Watch, which seeks to capture the same consumers looking for ways to better monitor their health.Continue reading