Modify the showStatistic

[BILLXYR]

No description provided.

[codecov-io]

Codecov Report

Merging #181 into master will decrease coverage by 0.27%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #181      +/-   ##
============================================
- Coverage     33.70%   33.43%   -0.28%     
  Complexity      357      357              
============================================
  Files           108      108              
  Lines          2317     2336      +19     
  Branches        161      162       +1     
============================================
  Hits            781      781              
- Misses         1477     1496      +19     
  Partials         59       59              

Impacted Files	Coverage Δ	Complexity Δ
...u/address/logic/commands/ShowStatisticCommand.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
src/main/java/seedu/address/ui/MainWindow.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
src/main/java/seedu/address/ui/PieChartWindow.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
src/main/java/seedu/address/ui/StatisticTable.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)

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