# --------------------------------------------------------------------
# USE OF NOAA GML DATA
# 
# These data are made freely available to the public and the
# scientific community in the belief that their wide dissemination
# will lead to greater understanding and new scientific insights.
# The availability of these data does not constitute publication
# of the data.  NOAA relies on the ethics and integrity of the user to
# ensure that GML receives fair credit for their work.  If the data 
# are obtained for potential use in a publication or presentation, 
# GML should be informed at the outset of the nature of this work.  
# If the GML data are essential to the work, or if an important 
# result or conclusion depends on the GML data, co-authorship
# may be appropriate.  This should be discussed at an early stage in
# the work.  Manuscripts using the GML data should be sent to GML
# for review before they are submitted for publication so we can
# ensure that the quality and limitations of the data are accurately
# represented.
# 
# Contact:   Ed Dlugokencky (303 497 6228; ed.dlugokencky@noaa.gov)
# 
# File Creation:  Mon Jun  7 07:57:47 2021
# 
# RECIPROCITY
# 
# Use of these data implies an agreement to reciprocate.
# Laboratories making similar measurements agree to make their
# own data available to the general public and to the scientific
# community in an equally complete and easily accessible form.
# Modelers are encouraged to make available to the community,
# upon request, their own tools used in the interpretation
# of the GML data, namely well documented model code, transport
# fields, and additional information necessary for other
# scientists to repeat the work and to run modified versions.
# Model availability includes collaborative support for new
# users of the models.
# --------------------------------------------------------------------
#  
#  
# See www.esrl.noaa.gov/gmd/ccgg/trends/ for additional details.
#  
#
# The uncertainty in the global annual mean is estimated using a monte carlo
# technique that computes 100 global annual averages, each time using a
# slightly different set of measurement records from the NOAA ESRL cooperative
# air sampling network.  The reported uncertainty is the mean of the standard
# deviations for each annual average using this technique. Please see
# Conway et al., 1994, JGR, vol. 99, no. D11. for a complete discussion.
#
# CO2 expressed as a mole fraction in dry air, micromol/mol, abbreviated as ppm
#
# NOTE: In general, the data presented for the last year are subject to change, 
# depending on recalibration of the reference gas mixtures used, and other quality
# control procedures. Occasionally, earlier years may also be changed for the same
# reasons.  Usually these changes are minor.
#
# year     mean      unc
  1980   338.91     0.10
  1981   340.11     0.10
  1982   340.86     0.10
  1983   342.53     0.10
  1984   344.08     0.10
  1985   345.55     0.10
  1986   346.96     0.10
  1987   348.68     0.10
  1988   351.16     0.10
  1989   352.79     0.10
  1990   354.05     0.10
  1991   355.39     0.10
  1992   356.10     0.10
  1993   356.83     0.10
  1994   358.33     0.10
  1995   360.18     0.10
  1996   361.93     0.10
  1997   363.05     0.10
  1998   365.70     0.10
  1999   367.80     0.10
  2000   368.98     0.10
  2001   370.57     0.10
  2002   372.59     0.10
  2003   375.14     0.10
  2004   376.95     0.10
  2005   378.97     0.10
  2006   381.13     0.10
  2007   382.90     0.10
  2008   385.01     0.10
  2009   386.50     0.10
  2010   388.76     0.10
  2011   390.64     0.10
  2012   392.65     0.10
  2013   395.39     0.10
  2014   397.34     0.10
  2015   399.65     0.10
  2016   403.09     0.10
  2017   405.22     0.10
  2018   407.61     0.10
  2019   410.07     0.10
  2020   412.46     0.10
