Click on possible answers in the right column to hide/show them on the graph. You can also hover over any line to see current value at that time. Graphs will begin to show data one hour after the question has been open. The Historical Trend chart does not display all prices ever reached since it is only updated at discrete time intervals, (hourly/daily/weekly, depending on the date range).
"Physical contact" refers to a collision, whether purposeful or not. Armed forces refers to official military units in control of a national government. Maritime law enforcement forces refers to Coast Guard or other nationally directed vessels, with armaments, outside the context of the official armed forces. "U.S. naval vessel or airplane" refers to a ship or plane that is the official property of the U.S. government, e.g. part of the U.S. armed forces or other U.S. government agency. "Japanese naval vessel or airplane" refers to a ship or plane that is the official property of the Japanese government, e.g. part of the Japanese Defense Forces or other Japanese government agency. Outcome will be resolved based on reporting from one or more of the following sources: BBC News or Reuters or Economist Online (http://www.bbc.co.uk/news/ or http://www.reuters.com/ or http://www.economist.com). If nothing is reported in these sources, then the 'status quo' outcome typically will be assumed (i.e., for a question about a political leader leaving office, an absence of reporting will be taken to indicate that the leader remains in office). Administrator reserves the right to use other sources as needed (e.g., CIA World Factbook, Wikipedia), provided those sources do not directly contradict concurrent event reporting from BBC News, Reuters, or Economist Online. In cases of substantial controversy or uncertainty, Administrator may refer the question to outside subject matter experts, or we may deem the question invalid/void. Before should be interpreted to mean at or prior to the end (23:59:59 ET) of the previous day.