my initial investment was apparently $4.84 x 400 = $1936 on March 27 2003 which since that date paid $3339 in dividends. $454 in 2020 alone (473 shares due to reinvest)
so you can say my annual “cost to yield” ratio is 454/1936 = 23.4% or be like myself and say its infinite 
(edit I’ve kept buying additional shares tho, after the reinvest, but that calculation is beyond my laziness at this time so just including initial purchase)