Year

X₀

Y

X₁

X₂

X₃

2005

1

1

1

1

1

2006

1.006075

1.030669

0.970358

1.052042

1.068173

2007

1.010632

1.063415

0.970371

1.097132

1.120327

2008

1.010352

1.089340

0.948301

1.134002

1.183851

2009

1.013254

1.132521

0.940462

1.196168

1.257602

2010

1.014561

1.168727

0.891471

1.298039

1.301379

2011

1.014159

1.186696

0.886607

1.318512

1.340700

2012

1.014406

1.187734

0.881042

1.309750

1.361382

2013

1.016723

1.217941

0.872768

1.337832

1.435695

2014

1.017739

1.230991

0.858698

1.336345

1.496513

2015

1.018544

1.238174

0.854189

1.328997

1.534872