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It's more interesting as log-scale cumulative returns. The fact that Buffett dramatically outperformed the S&P 500 in...uh, I think it was 1976, but it's hard to read on the chart...is mildly interesting, but the really striking figure would be "Given $1000 invested in Berkshire Hathaway in 1966 vs. $1000 invested in the S&P 500, where would you be now?"

It doesn’t have to be log scale, but you should use cumulative returns, ie add 1 to each number and calculate a cumulative product.

A line connecting the points would be very helpful.