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How much is 91?

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It's about the number of Keys on a Piano.
It's about nine-tenths the number of Wolves in Yellowstone National Park.
In other words, 91 is 0.875 times the count of Wolves in Yellowstone National Park, and the count of Wolves in Yellowstone National Park is 1.14 times that amount.
(a.k.a. Henihco'oo; a.k.a. Héetíhco'oo) (December 2014 figures; Wyoming Park area)
It's about three-fourths the number of Elements on the Periodic Table.
In other words, 91 is 0.771 times the count of Elements on the Periodic Table, and the count of Elements on the Periodic Table is 1.3 times that amount.
(a.k.a. Periodic Table of the Elements, a.k.a chemical elements) (confirmed elements as of 2016)
It's about one-and-three-tenths times the number of Submarines in the US Navy.
In other words, the count of Submarines in the US Navy is 0.77 times 91.
(a.k.a. Subs) (includes all types, all classes) (2015 figures)
It's about two-thirds the number of Union Stations in the United States.
In other words, 91 is 0.674 times the count of Union Stations in the United States, and the count of Union Stations in the United States is 1.48 times that amount.
(a.k.a. Union Terminal; a.k.a. Joint Station; a.k.a. Union Depot) (2016 figures)
Typically shared between multiple railroad companies and stations, there are about 135 "Union Stations" in the United States. Of these, the busiest station is Chicago Union Station, which handles 120,000 passengers each year.
It's about three-fifths the number of Moons in our Solar System.
In other words, 91 is 0.623 times the count of Moons in our Solar System, and the count of Moons in our Solar System is 1.61 times that amount.
(2015 figures) (confirmed moons only; dwarf planet satellites not included)
Astronomers and other scientists have confirmed the presence of 146 moons orbiting the major planets of our Solar System. About one third of those moons — 53 — are in orbit around the planet Saturn
It's about one-and-seven-tenths times the number of Countries in Africa.
In other words, the count of Countries in Africa is 0.59 times 91.
(2016 figures) (sovereign states recognized by the UN only)