Drescher 18Z pressure
1992       -       -       -       -       -       -       -       -       -       -       -   983.4
1993   993.2       -       -       -       -       -       -       -       -       -       -   981.5
1994   984.9       -       -       -       -       -       -       -       -       -       -   978.5
1995   984.1   978.9   980.8   984.4   979.1   985.5   992.6   982.3   979.8   982.7   979.4   977.1
1996   985.8   985.1   978.3   982.4   980.4   987.7   978.5   985.0   988.8   975.3   982.8   985.3
1997   987.8   987.6   975.0   985.7   978.4   988.3   979.8   980.9   977.9   981.2   987.1   988.8
1998   983.7   979.8   979.9   974.2   975.7   978.9   977.2   977.8   980.4   979.5   975.4   978.8
1999   984.5   983.9   984.0   976.6   980.8   993.6   981.1   974.8   979.8   969.7   979.8   974.0
2000   977.6   982.8   985.4   984.6   981.3   984.0   989.9   980.9   984.9   978.9   983.8   993.3
2001       -       -       -       -       -       -       -       -       -       -       -       -
2002       -       -       -       -       -       -       -       -       -       -       -   981.4
2003       -       -       -       -   980.8   991.8   982.1       -       -       -       -       -
2004       -       -       -       -       -       -       -       -       -       -       -       -
2005       -       -       -       -       -       -       -       -       -       -       -       -
2006       -       -       -       -       -       -       -       -       -       -       -       -
2007       -       -       -       -       -       -       -       -       -       -       -       -
2008       -       -       -       -       -       -       -       -       -       -       -       -
2009       -       -       -       -       -       -       -       -       -       -       -       -