The graph

The shown graph illustrates the employment figures in the US ( industrial, technological, sales and office,farming, fishing,foresting and other services) over the period of 80 years from 1930 to 2010
It clearly stands out from the graph that farming,fishing and foresting saw a dramatic decrease over the shown period compared to the others which experienced a gradual rise
In 1930, the figure of technological was almost 0 and much less than farming, fishing and foresting which was under 80. Meanwhile, sales, office and other services was nearly the same figure at around 10.From 1930 to 1960 almost every services was comparatively fluctuations before saw slightly changes.In 1970,industrial, sales,office and technical witnessed a slightly increase opposed to farming, fishing and foresting experienced a significantly decrease to almost 0 at the end of the period.Other services, in particular, reached a peak at under 20 before remaining unchanged for almost the rest of this period.