For the Fiscal year 2015, USCIS has received a total of 13,626 I-129 Petition for a Nonimmigrant worker for Intracompany Transferee with Specialized Knowledge (L-1B) petitions. Of the 13,626 petitions, approximately 76% (10,368) petitions were approved and approximately 25% were denied. Currently there are 2,116 L-1B petitions still pending.
The denials for L-1B petitions has significantly decreased from fiscal year 2014, where the denial rate for L-1B petitions was at a high 35%.
Sources:
http://www.aila.org/infonet/uscis-performance-data-l-1b-petitions-for-fy2015