The bar chart illustrates, the proportion of the sector contributions to 
Indian's
 gross domestic product for over four decades. 
Correct your spelling
India's
Overall
, it can be seen that the percentage of agriculture went down, Linking Words
while
 Industry and Linking Words
services
 went up. Use synonyms
Furthermore
, Linking Words
the 
agriculture was one Correct article usage
apply
the
 main contributors for over 3 decades , Change preposition
of the
however
 the Linking Words
last
 10 Linking Words
years
  Use synonyms
services
 were the main gross domestic product in India. 
On the one hand , the Use synonyms
persentage
 of agriculture started at just over 60% in 1960 and it was the main GDP for 30 Correct your spelling
percentage
years
. Use synonyms
This
 figure Linking Words
then
 decreased slightly every year and Linking Words
reach
 a bottom Wrong verb form
reached
to
 around 15 % in Change preposition
of
final
 Correct article usage
the final
years
. 
Use synonyms
On the other hand
 , Linking Words
Industry
 and Change preposition
in Industry
Services
 in India the rate  increased over 3 decades (around 25% and 28 % respectively). Use synonyms
Moreover
 , the industry stood Linking Words
in
 25% final Change preposition
at
years
, Use synonyms
whereas
 Linking Words
services
 increased rapidly and Use synonyms
reach
 Wrong verb form
reached
the
 peak Correct article usage
a
about
 63 % in 2000.Change preposition
of about