Larger image Source: CASIS FY17 Q2 Quarterly Report for the Period January 1 - March 31, 2017, page 12
Keith's note: When it comes to the utilization of the U.S. National Laboratory aboard the International Space Station, its what CASIS does with the free resources that they are offered by NASA that counts. The most important, and often the most limited resource, is crew time. As you can see in the figure above, as of mid-2017, CASIS has had a hard time using all of the crew time that NASA has given to CASIS.
Starting in mid-2018 CASIS stopped including detailed summaries of their actual ISS utilization (including previous year's percentages) in these quarterly reports to NASA. That's somewhat less than transparent. Let's see how they report how they have been doing in the past year. Stay tuned.
Larger image Source: CASIS FY18 Q2 Quarterly Report for the Period January 1 - March 31, 2018, page 22