Question: Plot the average gdp over time, seperately (but on the same graph) for cities that started programs in each of the years from 1989 to

Plot the average gdp over time, seperately (but on the same graph) for cities that started programs in each of the years from 1989 to 1991. Please provide the answer with R codes.

year city startyear gdp
1990 1 1989 265
1991 1 1989 266
1992 1 1989 275
1990 2 1989 266
1991 2 1989 422
1992 2 1989 526
1990 3 1990 332
1991 3 1990 520
1992 3 1990 225
1990 4 1991 652
1991 4 1991 366
1992 4 1991 991

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