Zhongshan 18Z station_level_pressure
1992       -       -       -       -       -       -       -       -       -       -       -       -
1993       -   978.8   986.5   985.3   982.0   983.5   978.1   976.4   979.9   977.8   982.6   983.9
1994   987.4       -       -       -       -       -       -       -       -   980.4   989.9       -
1995   984.3   986.5       -   986.6       -   988.3       -   983.6       -       -       -       -
1996       -       -       -       -       -       -       -       -       -       -       -       -
1997   987.2   984.0       -   990.9       -       -       -       -   980.5   982.6       -   990.5
1998       -       -   982.5       -   983.4   982.3   984.2   977.0   987.1   983.8       -   978.6
1999   986.3   988.1   988.2   981.7       -       -       -       -   983.3       -   979.5   976.5
2000   979.8       -       -       -       -       -       -       -       -   976.7       -       -
2001       -       -       -       -   986.4   984.0       -   980.3       -       -       -       -
2002       -       -       -       -       -       -       -   979.1   985.8   991.8   983.8       -
2003       -   987.2       -   981.3   987.5       -   986.8       -       -       -       -       -
2004       -       -       -       -       -   980.1   978.6   978.4   977.5       -       -       -
2005       -       -       -       -       -       -       -       -       -       -       -   995.0
2006   986.4   986.0   982.9   984.8       -       -       -   993.0   985.0       -   979.1   983.1
2007       -       -       -       -       -       -       -   983.5   984.3       -   984.2   981.3
2008   983.7   980.6   985.9   988.0   989.0   984.2   986.7   979.8   981.8   975.3   979.1       -
2009   985.1       -       -       -       -       -       -       -       -       -       -       -