Year

Mean CH₄ (ppmv)

Solar radiation MJ/m² (measured)

Solar radiation MJ/m² (predicted)

2003

2004

2005

2006

2007

2008

2009

2010

2011

2012

1740.994

1738.120

1737.331

1730.918

1740.740

1743.628

1750.178

1746.312

1759.923

1773.787

22.973

22.723

21.970

23.072

22.791

23.062

22.251

23.548

23.921

24.012

23.076

22.975

22.948

22.723

23.069

23.168

23.397

23.262

23.738

24.224