The data you requested are contained in these files:

If your web browser doesn't work with these FTP links, see this page.
    air.1981.nc
    air.1982.nc
    air.1983.nc
    air.1984.nc
    air.1985.nc
    air.1986.nc
    air.1987.nc
    air.1988.nc
    air.1989.nc
    air.1990.nc
    air.1991.nc
    air.1992.nc
    air.1993.nc
    air.1994.nc
    air.1995.nc
    air.1996.nc
    air.1997.nc
    air.1998.nc
    air.1999.nc
    air.2000.nc
    air.2001.nc
    air.2002.nc
    air.2003.nc
    air.2004.nc
    air.2005.nc
    air.2006.nc
    air.2007.nc
    air.2008.nc
    air.2009.nc
    air.2010.nc
    air.2011.nc
    air.2012.nc
    air.2013.nc
    air.2014.nc
    air.2015.nc