Line 1, West.
Point 1, 1992 is 8.6.
Point 2, 1993 is 7.5.
Point 3, 1994 is 6.9.
Point 4, 1995 is 6.4.
Point 5, 1996 is 6.2.
Point 6, 1997 is 6.
Point 7, 1998 is 5.3.
Point 8, 1999 is 5.1.
Point 9, 2000 is 4.
Point 10, 2001 is 4.6.
Point 11, 2002 is 5.3.
Point 12, 2003 is 5.6.
Point 13, 2004 is 5.3.
Point 14, 2005 is 4.9.
Point 15, 2006 is 4.7.
Line 2, South.
Point 1, 1992 is 6.9.
Point 2, 1993 is 6.4.
Point 3, 1994 is 5.5.
Point 4, 1995 is 5.2.
Point 5, 1996 is 5.2.
Point 6, 1997 is 4.7.
Point 7, 1998 is 4.3.
Point 8, 1999 is 4.1.
Point 9, 2000 is 3.9.
Point 10, 2001 is 4.7.
Point 11, 2002 is 5.4.
Point 12, 2003 is 5.8.
Point 13, 2004 is 5.8.
Point 14, 2005 is 5.4.
Point 15, 2006 is 5.1.
Line 3, Northeast.
Point 1, 1992 is 8.6.
Point 2, 1993 is 7.8.
Point 3, 1994 is 7.
Point 4, 1995 is 6.8.
Point 5, 1996 is 6.9.
Point 6, 1997 is 6.4.
Point 7, 1998 is 6.
Point 8, 1999 is 5.8.
Point 9, 2000 is 4.9.
Point 10, 2001 is 5.8.
Point 11, 2002 is 6.5.
Point 12, 2003 is 6.7.
Point 13, 2004 is 6.2.
Point 14, 2005 is 5.9.
Point 15, 2006 is 5.4.
Line 4, Midwest.
Point 1, 1992 is 9.
Point 2, 1993 is 8.5.
Point 3, 1994 is 7.9.
Point 4, 1995 is 7.6.
Point 5, 1996 is 7.9.
Point 6, 1997 is 7.2.
Point 7, 1998 is 7.1.
Point 8, 1999 is 6.6.
Point 9, 2000 is 5.4.
Point 10, 2001 is 5.8.
Point 11, 2002 is 6.4.
Point 12, 2003 is 6.7.
Point 13, 2004 is 6.1.
Point 14, 2005 is 5.5.
Point 15, 2006 is 4.9.