The line chart illustrates the labour force employment in five economic sectors 
in 
between the period 1930 to 2010 in the USA . 
To commence with ,  Change preposition
apply
overall
 The number of people who were employed in industrial , sales and office and technical increased  over the past 80 years , Linking Words
while
 the population in farming, fishing and foresting decreased dramatically . It is Linking Words
also
 noticeable that employees in the remaining services were the most stable despite the fluctuation in the beginning period.Between  1930 and 2010, the percentage of employees in industrial and technical  rose  drastically  to approximately 38 % and 30 % respectively The number of sales and offices Linking Words
also
  increased ,but much less significantly to just 20% . 
Linking Words
By contrast
, the figure for employees in  farming,fishing and foresting showed a downward trend, dropping sharply from 78% to nearly 3% Linking Words
at the end
of the period .Linking Words