On page 52, we noted that the growth rate of per capita GDP in the United States between 1870 and 1929 was slightly lower than 2.0%, while the growth rate between 1950 and 2015 was slightly higher. Using the following table, calculate the actual average annual growth rates during these two periods.

Year                                       U.S. Income

1870 …………………………..  $  3,203

1929 …………………………..  $  8,669

1950 …………………………..  $ 14,398

2015 …………………………..  $ 50,798