Investors have pulled nearly $80 billion this year out of mutual funds that invest in U.S. stocks. That's the tally after investors yanked $5.5 billion from all types of mutual funds in the last week of September.

Hardest hit once again: Funds that invest long-term in U.S. stocks.

Domestic equity funds took a $5.6 billion hit. That compares to a $3.9 billion hit the previous week and just $487 million taken out in the last week of August.

All told, investors have pulled $79.1 billion out of domestic stock funds, this year, according to figures compiled by the Investment Company Institute.

And for the 12 months that ended August 31, $108.1 billion has been pulled out of such funds.

ICI makes its estimates from data covering more than 95 percent of industry assets and are adjusted to represent industry totals.

Hybrid funds, which invest in both stocks and bonds, had outflows of $2.6 billion, compared to inflows of $1.4 billion the previous week.

Bond funds had estimated inflows of $3.54 billion, compared to estimated inflows of $1.72 billion during the previous week.

Taxable bond funds saw estimated inflows of $3.46 billion, while municipal bond funds had estimated inflows of $80 million.

-- This article first appeared on Securities Technology Monitor.