年份

真实值

预测值

相对误差/%

2011

301.81

301.81

0.00%

2012

303.02

302.93

−0.03%

2013

308.17

307.41

−0.24%

2014

307.60

308.86

0.41%

2015

299.30

299.23

−0.02%

2016

290.60

289.92

−0.23%

2017

284.90

285.29

0.14%

2018

287.80

286.69

−0.39%

2019

283.40

282.45

−0.34%

2020

261.10

259.69

−0.54%