Possession_Island pressure
1993   987.8   970.9   978.9   976.1   975.4   968.0   967.2   970.7   969.6   966.6   973.0   976.1
1994   978.5   974.8   971.2   977.8   978.9   992.7   982.2   969.6   981.9   970.5   976.0   973.2
1995       -   974.8   981.5   976.8   973.0   983.1   992.0   979.7   970.0   970.1       -       -
1996   979.0   981.8   976.0   973.7   977.6   973.3   977.8   979.0   984.4   966.1       -       -
1997   981.8   979.0   970.7   979.7   968.0   977.3   973.8   970.6   972.4       -       -       -
1998       -   972.8   974.0   969.5   975.1   971.3   974.1   970.3   979.1       -       -       -
1999       -   978.8   976.1   971.8   972.8   988.2   972.1   977.8   975.4       -       -       -
2000       -   975.2   975.8       -   975.6   980.2   976.7   976.9   981.9       -       -       -
2001   983.8   981.6   978.0   971.8   979.9   975.1   981.0   976.6   974.8   966.2   970.4   970.6
2002   976.8   971.5   982.2   974.0   982.4   984.8   983.3   973.0   978.1   982.2   975.7   972.1
2003       -       -       -       -       -       -       -       -       -       -       -       -
2004       -       -       -       -       -       -       -       -       -       -       -       -
2005       -       -       -       -       -       -       -       -       -       -       -       -
2006       -       -       -       -       -       -       -       -       -       -       -       -
2007       -       -       -   977.9   981.6   979.5   989.0   974.2   971.9   974.7   975.9   970.9
2008   972.3   972.1   977.3   979.2   978.8   969.0   974.9       -       -   967.3       -       -
2009       -       -       -       -       -       -       -       -       -       -       -       -