F-Secure:

Android malware has been strengthening its position in the mobile threat scene. Every quarter, malware authors bring forth new threat families and variants to lure more victims and to update on the existing ones. In the fourth quarter alone, 96 new families and variants of Android threats were discovered, which almost doubles the number recorded in the previous quarter.

Android accounts for 79 percent of the security threats for mobile platforms. iOS barely registers in the results, despite the fact there are hundreds of millions of users. F-Secure published a PDF with all of the results.

Good luck Android users.