AWOTE doesn't support unsorted vectors

[DaniWood]

grattan::awote(fy.year = c("2017-18", "2014-15"))
#> [1] 1479.70 1576.95
grattan::awote(fy.year = c("2014-15", "2017-18"))
#> [1] 1479.70 1576.95

^{Created on 2019-11-09 by the reprex package (v0.3.0)}