about 5.836 billion
How many U.S. debit cards were in circulation in 2018?
There were about 5.836 billion debit cards in circulation in the U.S. in 2018, of which 71.7% were prepaid cards.
Source: Wikipedia (Debit card) (2018) en.wikipedia.org
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Back in 2001, debit cards made up 9% of U.S. purchase transactions. By what year was that share projected to roughly double, to 18.82%?

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about 5.836 billion
There were about 5.836 billion debit cards in circulation in the U.S. in 2018, of which 71.7% were prepaid cards.
Source: Wikipedia (Debit card) (2018) en.wikipedia.org
about 4 out of 5 (4 in 5)
By 2019, contactless payments made up about 4 out of 5 point-of-sale credit card purchases in Australia, among the highest adoption rates in the world.
Source: Wikipedia (Contactless payment) (2019) en.wikipedia.org
over 142 million cards
The UK had more than 142 million contactless-enabled cards and over 147,000 contactless terminals in use as of October 2021.
Source: Wikipedia (Contactless payment) (2021) en.wikipedia.org
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