YEARS

CO₂

U(t_i)

U'(t)

2009

387.1489

1.694

−1.078

2010

381.1618

1.539

−1.232

2011

382.8326

0.769

1.078

2012

386.8387

2.309

0.924

2013

388.2413

1.386

−1.078