only 46% of US university students graduate their programs?
... but it turns out it is actually a little better than that overall:
"The 2011 graduation rate for full-time, first-time undergraduate students who began their pursuit of a bachelor's degree at a 4-year degree-granting institution in fall 2005 was 59 percent. That is, 59 percent of full-time, first-time students who began seeking a bachelor's degree at a 4-year institution in fall 2005 completed the degree at that institution within 6 years."
There are some differences in graduation rates, though, with some being even more dismal than 46%:
"Among full-time, first-time undergraduate students who began seeking a bachelor's degree at a 4-year degree-granting institution in fall 2005, the 6-year graduation rate was 57 percent at public institutions, 65 percent at private nonprofit institutions, and 42 percent at private for-profit institutions. This graduation rate was 56 percent for males and 61 percent for females; it was higher for females than for males at both public (59 percent vs. 54 percent) and private nonprofit institutions (67 percent vs. 62 percent). At private for-profit institutions, however, males had a higher graduation rate than females; the rate was 48 percent for males and 36 percent for females. "
National Center for Education Statistics at https://nces.ed.gov/FastFacts/display.asp?id=40