Zhongshan 18Z msl_pressure
1990       -       -       -       -       -       -       -       -       -       -       -       -
1991       -       -       -       -   987.4       -       -   983.5       -       -       -       -
1992       -       -       -       -       -       -       -       -       -       -       -       -
1993       -   981.2   988.7       -   984.3   986.1   980.4   978.7   982.3   979.6       -   986.0
1994   989.6       -       -       -       -       -       -       -       -   982.7   992.1       -
1995   986.4   988.7       -   989.1       -   990.7       -   985.9       -       -       -       -
1996       -       -       -       -       -       -       -       -       -       -       -       -
1997   989.4   986.1       -   993.2       -       -       -       -   982.9   984.9       -   992.7
1998       -       -   984.7       -   985.7   984.7   986.5   979.3   988.9   986.1       -   981.0
1999   988.5   990.3   990.4   984.0       -       -       -       -   985.6       -   981.7   978.7
2000   982.0       -       -       -       -       -       -       -       -   979.0       -       -
2001       -       -       -       -   988.7   986.3       -   982.7       -       -       -       -
2002       -       -       -       -       -       -       -   981.4   988.1   993.8   986.1       -
2003       -   989.4       -   983.6   989.8       -   989.0       -       -       -       -       -
2004       -       -       -       -       -   982.4   980.8   980.7   979.8       -       -       -
2005   988.7       -       -       -       -       -       -       -       -       -       -   997.2
2006   988.1   988.0   985.4   987.2       -       -       -   995.3   987.3       -   981.3   985.5
2007       -       -       -       -       -       -       -   985.8   986.6       -   986.6   983.3
2008   985.8   982.6   988.1   990.3   991.3   986.6   989.0   982.1   984.2   977.6   981.6       -
2009   987.1       -       -       -       -       -       -       -       -       -       -       -