year

Y (billion)

Predicted value (billion)

relative error

2008

2767.726

2531.852

0.08522

2009

2900.533

2702.854

0.06815

2010

3197.46

2993.954

0.06365

2011

3896.959

3667.178

0.05896

2012

4231.038

4023.456

0.04906

2013

4712.732

4601.321

0.02364

2014

5185.961

5089.899

0.01852