522 Billion Transactions cash per year
726 Billion Transactions online per year

Summe: 3,5 Billion Transaction per day

200 Byte per Transaction 
= 651,925 GByte per Day

~ 8 Billion Humans on Earth

~ 134 MB per Block File/ ~ 700.000 Transaction per Block File
~ 5.000 Block Files per Day
~ 1.780.000 Block Files per Year
~ 2.412 years until uint32 block nr overflow