The government announced on October 27, 2015 that a record number of U.S. citizens, for the quarter renounced. These 1,426 former U.S. citizens combine for the year to equal more than 3,200 former citizens for the three quarters. The last year 
annual record of former citizens of just more than 3,400 will soon be broken by the end of the year.
All of the names of the individuals are reported at the Federal Register: Quarterly Publication of Individuals, Who Have Chosen To Expatriate, as Required by Section 6039G
See prior posts New Record of U.S. Citizens Renouncing – The New Normal, dated February 10, 2015.
Also, see the recent article in CNN Money, A record 1,426 Americans return their passports