APNIC Secretariat kindly provided the following data. I hope this will help.
+------+-----------+-----------+ +------+-------------+-------- ---+
| | Total | Number of | | | Delegations | Number of |
| Year | Transfers | /24s | | Year | from 103/8 | /24s |
+------+-----------+-----------+ +------+-------------+-------- ---+
| 2011 | 2 | 2 | | 2011 | 821 | 3032 |
| 2012 | 21 | 68 | | 2012 | 1028 | 3300 |
| 2013 | 16 | 61 | | 2013 | 1419 | 4767 |
| 2014 | 25 | 95 | | 2014 | 2095 | 7271 |
| 2015 | 67 | 266 | | 2015 | 2425 | 8316 |
| 2016 | 103 | 394 | | 2016 | 2966 | 9913 |
+------+-----------+-----------+ +------+-------------+-------- ---+