Period

Equation

R²

Period 1

y = −47.867x + 111.84

1

Period 2

y = 0.1078x² − 1.7808x + 10.64

0.986

Period 3

y = −0.1649x + 2.9508

0.9904

Period 4

y = 0.0019x² − 0.085x + 1.7029

0.9849

Period 5

y = −0.0159x + 0.7691

0.997

Period 6

y = −0.0156x + 0.5008; y = −0.0074x + 0.4749; y = −0.0046x + 0.364

1; 0.9982; 0.98

Period 7

y = −0.0038x + 0.293; y = −0.0026x + 0.2839; y = −0.0017x + 0.2436;

1; 0.9726; 0.9552