The graphic charts above 
illustrates
 Change the verb form
illustrate
proportion
 Correct article usage
the proportion
number
 of new houses in almost a decade from 2000 to 2009 in Derby and Nottingham.
It's clear that in 2009, both two cities reached its peak of their highest Use synonyms
number
. Use synonyms
Moreover
, every Linking Words
cities
 Change to a singular noun
city
show
 different trends Correct subject-verb agreement
shows
in 
each Change preposition
apply
year
.
Use synonyms
Firstly
 we will talk about Derby. The Linking Words
number
 in Use synonyms
this
 city shows Linking Words
gradual
 increase as per Correct article usage
a gradual
new
 Correct article usage
the new
year
. It Use synonyms
starting
 from below 50 Wrong verb form
started
house
 in 2000 and in 2003 it escalated the growth Fix the agreement mistake
houses
number
 Use synonyms
at
 above 100 and kept stable until 2007. Change preposition
to
Therefore
, it Linking Words
shows
 Wrong verb form
showed
significantly
 increases in 2008 by approximately Change the word
significant
above 
250 and it kept growing until reached almost 350 in 2009.
Change preposition
apply
Secondly
, in Nottingham, it's pretty much different from Derby. The proportion in each Linking Words
year
 is very fluctuative. In early 2000, Nottingham only reached above 50, Use synonyms
Linking Words
however
 it didn't grow and eventually dropped below 30 in 2002. Next Add a comma
,however
year
, it Use synonyms
shows
 Wrong verb form
showed
Correct article usage
a slightly
slightly
 improvement in 2003 by approximately 50 and Change the adverb
slight
Wrong verb form
continued
continue
 grow until 2005 before it decreased extremely in 2006 Add the particle
 tocontinue
nearly
 0. It came back stronger in 2007 by around 200 and dropped dead again Change preposition
to nearly
nearly
 zero in 2008.Change preposition
to nearly