#
#  File: HFC134a_national_emissions_combined.txt
#  Creation Date: 2024-04-10
#
#  Point of contact: lei.hu@noaa.gov
#
#  Emissions published in:
#
#      Hu, L., et al. (2017), Considerable contribution of the Montreal Protocol to declining
#          greenhouse gas emissions from the United States, Geophys. Res. Lett., 44, 8075–8083,
#          doi:https://doi.org/10.1002/2017GL074388.
#
#
#  Citation for the "US Emission Tracker for Potent GHGs" website:
#
#      Hu, L., Montzka, S., Vimont, I., Andrews, A., Dutton, G., & NOAA Global Monitoring Laboratory. (2023).
#          US Emission Tracker for Potent GHGs. NOAA GML. https://doi.org/10.15138/ECY2-RX35.
#
#
#  Data use policy: https://gml.noaa.gov/hats/hats_datause.html
#
#  If you use this data in a publication or report, we request that you contact the principal
#  investigators first and discuss your interests.  We are trying to encourage scientific discussion.
#  The PIs can discuss the quality of the data and any potential problems with its analysis. Furthermore, if 
#  you use the data in any presentation or publication, you must cite the appropriate articles in which these
#  data were first presented and give credit to the National Oceanic and Atmospheric Administration (NOAA)/
#  Global Monitoring Laboratory (GML) in Boulder, Colorado as the source of the data.
#
#  These are the emission results from 12 ensemble members considering
#  two prior emission estiamtes three background and two transport models
#
#  Units: Gg/y
#  Lower and upper bounds are 2-sigma estimates.
#
year, best, lower_bound, upper_bound
2008.5,  48.10,  37.60,   58.60
2009.5,  45.10,  34.30,   55.90
2010.5,  52.50,  41.80,   63.20
2011.5,  48.20,  38.60,   57.80
2012.5,  43.70,  36.00,   51.40
2013.5,  43.30,  35.30,   51.30
2014.5,  50.10,  41.80,   58.40
2015.5,  44.00,  35.60,   52.40
2016.5,  52.60,  45.20,   60.00
2017.5,  56.50,  48.30,   64.70
2018.5,  56.40,  46.70,   66.10
2019.5,  58.00,  48.20,   67.80
2020.5,  51.80,  42.40,   61.20
2021.5,  51.90,  43.80,   60.00