Which one is not like the others?

Earlier this week I showed the shocking decline of Fixed Private Investment relative to total accumulated debt:

Graph #1: Fixed Private Investment relative to Total Debt
It shows significant changes before the 1980 recession, after the 1990 recession,
before the 2001 recession, and toward the end of the 2007-2009 recession.

Today, we look at Fixed Private Investment relative to components of the total debt:

Graph #2: Fixed Private Investment relative to Nonfinancial Debt
It shows significant changes before the 1980 recession, after the 1990 recession,
before the 2001 recession, and toward the end of the 2007-2009 recession.

Graph #3: Fixed Private Investment relative to the Publicly Held part of Federal Debt
It shows significant changes before the 1980 recession, after the 1990 recession,
before the 2001 recession, and toward the end of the 2007-2009 recession.

Graph #4: Fixed Private Investment relative to Non-Federal Non-Financial Debt
It shows significant changes before the 1980 recession, after the 1990 recession,
before the 2001 recession, and toward the end of the 2007-2009 recession.

Graph #5: Fixed Private Investment relative to Household Debt
It shows significant changes before the 1980 recession, after the 1990 recession,
before the 2001 recession, and toward the end of the 2007-2009 recession.

Graph #6: Fixed Private Investment relative to Financial Debt
It seems to show a trend change toward the end of the 2007-2009 recession.

Which one is not like the others?