年份

r[x(k), x₁(k)]

r[x0(k), x₂(k)]

r[x0(k), x₃(k)]

2012

0.806432665

0.771140761

0.624454042

2013

0.458032271

0.728156761

0.872438296

2014

0.499513773

0.798187952

0.77186088

2015

0.563117548

0.867810454

0.433062678

2016

0.339563812

0.958352416

0.34591323

2017

0.872826316

1

0.905977262

2018

0.65250944

0.885003761

0.872708324

2019

0.524670755

0.626085099

0.57248837

r(x₀, x_i)

0.589583323

0.829342151

0.674862885