Trend

h

P-value

Z-statistics

Tau

Slope

First decad (1981-1990)

Increasing

false

0.41289

0.81883

0.05070

0.08884

Second decad (1991-2000)

Decreasing

false

0.80472

0.24724

0.01541

0.02332

Third decad (2001-2010)

Increasing

false

0.74566

0.32435

0.02016

0.03708

Fourth decad (2011-2020)

Increasing

false

0.24828

1.15453

0.07143

0.16294

1981-2020

Increasing

true

0.01838

2.35781

0.07201

0.03545