The provided line graphs illustrate the trends of 
Australian
 Use synonyms
dollars
' value of Use synonyms
Australian
 trade in three different countries, namely China, Japan and the United States, over a period of five years from 2004 Use synonyms
till
 2009. 
Change preposition
to
Overall
, the first line chart shows a continuous increase in China, Linking Words
whereas
, Japan's chart shows a clear fluctuation trend. Looking at Linking Words
United
 States graph changes, it had more stable values with slight increases and decreases.  
Looking at Correct article usage
the United
china's
 data graph in more detail, it had a gradual rise in exports till the year 2007 Capitalize word
China's
then
 it had a noticeable rise till reaching 35 Linking Words
million
 Use synonyms
Australian
 Use synonyms
dollars
 in 2009. Use synonyms
In contrast
, Importing values had a steady increase until it realised 30 Linking Words
million
 Use synonyms
Australian
 Use synonyms
dollars
 in 2008 Use synonyms
then
 had a solid trend till the end of the given period. 
Linking Words
According to
 the details of Japan's graph, it had a clear fluctuation trend with a sharp drop in 2006. Linking Words
On the other hand
, Importing values had more stable changes until reaching the value of 22 Linking Words
million
 Use synonyms
Australian
 Use synonyms
dollars
 approximately in 2007. Followed by a 2 Use synonyms
million
 decrease nearly. 
Back to the line chart of the United States, it had more slight rise in both exporting and importing reaching 15 and 25 Use synonyms
million
 Use synonyms
dollars
 approximately Use synonyms
then
 a decrease Linking Words
came 
after in 2008 to reach 10 and 20 Verb problem
apply
millions
, respectively.Change to singular
million