I must admit my mistake of not taking into account the 4 stock splits since 1988, so I am adjusting the rough math to better reflect the worth of the dividends payed.
I did a simplification and approximation like this: I took your 400 million shares and split it 4 times to get 25 million shares. Then, without any "time value of money" adjustments I simply multiplied the sum total of $26.14 times 25 million shares to get $653,500,000 non-inflation dollars.
I added your $14.5 billion stock owned value to the roughly estimated $653,500,000 dividend value and get about $15,153,500,000 in approximate total returns.
In order to get a better look at your percent gain, I took the $15,153,500,000 estimated total return and divided by your cost of $1.299 billion and get about 11.71 for a percentage return of 1171%
1171% divided by 25 years = about a 46.8% return per year
Could this be right? Am I overestimating or underestimating?