In the mid-80's, about 25 years ago, I bought a hard disk drive for my home computer.  It cost about $500 for the drive itself ($900 for the entire package) and had 20 million bytes of storage.

Last year I bought a hard disk drive for my home computer.  It cost $90 and has 1 trillion bytes of storage.

Let's do the math. The old drive was $25 per megabyte. The new one was $0.00009 per megabyte, so the old drive was 277,777 times more expensive per megabyte. That's 27 million percent.

A car cost about $10,000 back then, and got about 20 miles per gallon.  At the same rate of improvement and pricing, a car today would cost $1800 and get 1,000,000 miles per gallon.

Another comparison: if typed out, the old drive would make a line of characters from here to Clearwater, 31.5 miles. The new drive would make a line from here to the moon and back 3 times: 1.578 million miles.