Total number of reference transactions in university libraries in New Zealand from 2009 to 2014 (in thousands)
Other statistics on the topic
Trend in budget changes at academic libraries in the U.S. in 2016
U.S. academic library collection circulation in 2015, by type of degree granted
Amount of money spent on librarian salaries/wages at academic libraries in 2015 U.S.
Faculty/librarian opinion on academic library service quality U.S./Canada 2015