Find the dividend yield trend for two S&P 500 companies

Find the dividend yield trend for two S&P 500 companies for the past two years and answer the following questions:

Is the yield increasing, decreasing or unchanged?

In qualitative terms, discuss how the applicability of the dividend discount model is affected by changes in the dividend for the chosen company.

Besides the yield direction, are there any stock specific properties that might make your answer different for other stocks in the index?