### Automobile Production: Table, Graph and Modeling

The table shows the retail market share of passenger cars from Ford Motor Company as a percent of the US market. Year Market share 1980 17.2% 1885 18.8% 1990 20.0% 1995 20.7% 2000 20.2% 2005 17.4% A mathematical model for this data is given by f(x) = -0.0206x^2