It appears that Dr. Austin published these findings in 1991. This relates to research conducted “between the late 1960s and the mid-1980s American college students became much more focused on material goals and less concerned with altruism and social problems.”
Here is the source:
Astin, A. (1991). The changing American college student: implications for educational policy and practice. Higher Education, 22(2), 129-143. doi:10.1007/BF00137472