Tallying last year's figures for the ETF and ETP industries in the U.S., the latest analysis from London-based industry research firm ETFGI shows that there were $52.7 billion in net new asset inflows in December among U.S.-listed ETFs and ETPs - the most ever in a single month.

The number of ETFs and ETPs that have over $1 billion in assets increased during 2014 to 251, adds EFTGI, which is headed by co-founder Deborah Fuhr. Additionally, the group of ETF and ETP providers grew to 71 at the end of 2014 from 58 at the end of 2013.

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