In the context of all takeovers, are hostile takeovers rare?

1. How are underwriting and M&A linked? Do investment banks have to have both?
2. Look at the Thomson Financial League tables on the Web (http://www.thomsonreuters.com/ products services/financial/league_tables). Who are the top debt underwriters, top equity underwriters, and top M&A advisors this year?
3. In the context of all takeovers, are hostile takeovers rare?