AL has won majority of the close contests, closely followed by BNP.
Analysis of close contest wins and losses for the big parties. Close contests are considered where the vote difference % of top 2 candidates are less than 10%.

Pie chart showing the % of seats big parties have won through a close contest (vote difference % <10%).

Pie chart showing the % of seats big parties have lost through a close contest (vote difference % <10%).

Distribution of the vote difference % for each year shows that as years went by, election results became more polarised.