Region |-----------1959 - 1988 trends----------|
Trend N ( 95% CI ) Sign. Rel. Abu.
BC 0.2 21 -0.8 1.3 0.11
CAL -0.5 47 -1.4 0.4 0.04
COL 0.6 29 -3.6 4.7 1.09
ILL -0.7 21 -1.9 0.4 0.06
IA -2.3 17 -7.1 2.6 4.28
KAN -2.0 39 -5.1 1.1 105.92
MIN -0.4 19 -1.5 0.7 0.08
MO -5.1 26 -7.3 -2.9 *** 3.21
MON 1.8 19 0.6 3.0 *** 0.16
NEB 0.3 18 -5.7 6.3 16.19
NM 0.2 14 -0.6 1.0 0.08
OKL -1.3 25 -3.2 0.7 31.20
ORE -0.1 29 -1.1 0.9 0.07
SD -1.1 15 -3.2 0.9 1.02
TEX -3.2 82 -7.1 0.6 13.81
WAS -0.5 17 -2.1 1.1 0.04
SUR -2.2 595 -4.3 -0.1 ** 5.61