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If I have 5 numbers that represent the area of a forest from 5 separate years, is it possible to yield 4 pairwise comparisons? I would like to know if the change in area is significant from year to year, but cannot figure out which statistical test to use since I only have one measurement (the area) in each treatment (the year).

(Note: I've tried to justify using the z-test, t-test, and ANOVA, but I either cannot assume normality or have too few observations within each group.)

Any guidance would be much appreciated. Thank you in advance.

p.s. This is for my job, not for homework.