In the late 90's companies were investing cash to grow their businesses leaving less for dividends. Today the environment is different: subpar growth / low visibility, companies tend to spend more on buying back their shares and/or growing their dividends. Hope this helps, Sébastien
The payment of dividends may also be a negative signal. The dividend distribution might look like a lack of investment opportunities and liquidity is then distributed to shareholders. See the case of Microsoft.
This paper might give you perhaps some part of the answer
B Buchanan,C Cao, E Liljeblom,S Weihrich, "uncertainty and firm dividend policy - a natural experiment", Journal of Corporate Finance, 2017, 42, p 179 -197.