Year

Mean CH₄ (ppmv)

Relative humidity % (measured)

Relative humidity % (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

81.567

81.207

79.705

80.560

79.938

78.871

84.289

84.700

85.781

87.538

80.902

80.321

80.162

78.866

80.850

81.434

82.757

81.976

84.725

87.526