The graph gives information about labour force employment in the USA in the years between 1930 to 2010.
Overall, the percent of employment in industrial, technical, sales and office and other services increased with time, compared with the percentage in the farming, fishing, and foresting which was decreased.
First of all, there was no industrial employment from 1930 to 1960, then it increased gradually to its peak in 2010 with about 39 %. In addition, technical employment was zero in 1930 to 1940 then increased to reach nearly 39 % in 2010. While, sales and office employment was fluctuating with lowest percent in 1940 and highest in 2010 with 0 % and 20 % respectively. In contrast, other services employment was approximately 10 % in 1930, then, it increased to about 18 % in 1940, after that it reduced in the following years, then it reached a steady state with about 9 % between 1970 and 2010.
Second, unfortunately farming , fishing and foresting employment percent was the highest in 1930 with nearly 78 % it gradually diminished to about 2 % in 2010.
