Why does Vanguard's Dividend Growth Fund not show dividend growth according to yahoo finance's historical distribution data?
In 1993, Vanguard's Dividend Growth Fund Investor shares (from here on out it will be known as VDIGX) distributed a total of $0.96 in dividends. If I had bought a share on Jan 4, 1993 at 10.93, then I would have gotten an insane 8.7% dividend yield which is significantly higher than the S&P 500's 2.7% dividend yield. However, in 2013, the total annual dividend paid was about $0.49, which a lot less than the dividend I would've gotten in 1993. Note all of this data was obtained using yahoo finance.
While the above example used specific dates, it does appear that, when graphing the data, the dividends have not been growing at all in this fund. What I would like to know is whether the data I am looking at is accurate. Specifically, are the dividends in yahoo finance adjusted for inflation and that's why there doesn't appear to be any dividend growth in the fund. If its not inflation, then could someone provide a reasonable explanation as to why there doesn't appear to be any dividend growth?