There are several mistakes in your summary.
1.
The graph( it only singular, but i get the picture from other summaries that more than 3 pie charts) show about
result of survey( too similar with the question)( change with the outcome of examination of people opinions)to employees regarding their activity...
2. In Writing task I, you
SHOULD BE write
AT LEAST 150 words, your summary only 149 words.
3.
and there was a slight increase in 2005 and 2009. -->
all of aspects was increase?. i think you give wrong information.
4. Remember, you should use
PAST TENSE in your summary,EXCEPTION the introduction sentence.
2005 employees who
do did not
have had a supervisor
are were equal only 1 percent.
who answer fair
has had a few different.
who answer
do not have did not had
5.
In addition, who answer fair has a few different. Moreover, in 2009 ...
From the graph, as we know most of employees has tend to has good relationship ... --->
it looks like overview sentence as you are not give the percentage each parts and only give general statement without the number from the data.