Halley 18Z station_level_pressure
2001   987.2   988.9       -   979.4   990.5   982.2   984.8   977.2   978.9   972.4   976.6       -
2002       -   979.2   988.3       -       -   981.0   986.7   979.5   984.2       -       -   982.4
2003   993.9       -   985.5   979.5   981.3       -   984.2       -       -   983.3   984.2   991.2
2004       -       -       -       -       -       -   980.3   981.9       -       -       -       -
2005   987.5       -   984.5   978.8   987.1   990.9   984.6   981.7   985.6   982.5   985.7   995.8
2006   985.9   986.5   982.9   983.0       -   986.0   978.6   987.5   984.0   977.5   978.6   985.5
2007   987.0       -   985.1   991.6       -       -   994.3   983.5   989.3   981.7   983.9   978.4
2008   983.8   981.9   982.4   986.8   986.9   984.1   980.9   979.4   985.3   976.7   978.5   977.0
2009   981.1       -       -       -       -       -       -       -       -       -       -       -