Great_Wall 18Z station_level_pressure
1993       -       -       -       -       -       -       -       -       -       -       -       -
1994       -       -       -       -       -       -       -       -       -       -       -       -
1995       -   991.2   982.6       -   991.8   988.6   990.0   994.1   988.0   992.5   981.9   986.4
1996   990.4   988.7   985.3   995.3   985.7   991.6   989.0   988.6   995.6   984.3   976.6   986.8
1997   986.2       -   988.5   985.1   997.1  1001.1   989.0   983.2   992.2   989.4   995.2       -
1998   983.8   993.4   989.2   993.7   999.7   994.1   977.5   984.7   989.5   979.5   982.3   981.1
1999   988.1   983.8   994.7   986.7   992.0   995.6   988.7   988.1   989.0   983.6   986.4   981.7
2000   980.7   994.3  1002.3       -       -       -       -       -       -       -       -       -
2001       -       -       -       -       -       -       -       -       -       -       -       -
2002       -       -       -       -       -       -       -       -       -       -       -       -
2003       -       -       -       -       -       -       -       -       -       -       -       -
2004       -       -       -       -       -       -       -       -       -       -       -       -
2005       -       -       -       -       -       -       -       -       -       -       -       -
2006       -       -       -   991.2       -       -   992.0   998.8   990.7       -   981.9   985.4
2007   988.9   986.6       -   989.4       -       -   995.0   986.8   996.4   984.0   990.1   983.3
2008   986.9   988.2   989.7   986.9   993.2   992.9   996.1   992.5  1000.9       -   984.2   981.9
2009   984.6       -       -       -       -       -       -       -       -       -       -       -