Faster than Moore's Law?
That 50 million increase took place over 41 years, a rate of improvement fantastically faster than Moore's Law, which, the article said involves, "doubling the power and memory of computer semiconductors every 18 months".
41 years is just over 27 periods of 18 months. 2^27 is over 134 million, so a nearly three times faster rate of improvement than Kryder's Law (as you'd expect with a doubling every 18 months vs every 2 years).