Figure 9 shows the number of automobile fatalities and the total number of miles driven (among all Americans) for each year over a period of more than four decades. In terms of death rate per mile driven, how has the risk of driving changed?

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Deaths 40,000 30,000 20,000 10,000 0 + + + 3.6 60,000 Bars represent the The line represents number of deaths (left axis). vehicle-miles driven (right axis). 3.0 50,000 2.4 1970 1971 1972 1973 Figure 9 1974 1975 1976 1977 + 1978 1979 1980 1981 1 + 1 + T + 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 Year 1999 I + + 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 0.0 8 Vehicle-miles (trillions)