1.42 The Boston Marathon. Women were allowed to enter the Boston Marathon in 1972. Here are the times (in minutes, rounded to the nearest minute) for the winning women from 1972 to 2015.

Make a graph that shows change over time. What overall pattern do you see? Have times stopped improving in recent years? If so, when did improvement end?

Year Time Year Time Year Time Year Time
1972 190 1983 143 1994 142 2005 145
1973 186 1984 149 1995 145 2006 143
1974 167 1985 154 1996 147 2007 149
1975 162 1986 145 1997 146 2008 145
1976 167 1987 146 1998 143 2009 152
1977 168 1988 145 1999 143 2010 146
1978 165 1989 144 2000 146 2011 142
1979 155 1990 145 2001 144 2012 151
1980 154 1991 144 2002 141 2013 146
1981 147 1992 144 2003 145 2014 139
1982 150 1993 145 2004 144 2015 145