What is the approximate proportion of ‘mergers’ to ‘acquisitions’ for the entire period (2001 - 02 to 2006 - 07)?

From the given table, we can calculate two tables. One for mergers and one for acquisitions. 
For Mergers, 

For Acquisitions, 

Total no. of mergers and acquisitions during the given period = 5646

Total no. of mergers during the given period = 1499

Total no. of acquisitions during the given period = 5646 - 1499 = 4147

Hence required percentage is $$\frac{1499}{4147}\times\ 100=37\%\ \left(approx\right)$$