What factors account for the large increase in coupon redemptions? Will the growth continue? Why or why

Question:

What factors account for the large increase in redemptions? Will the growth continue? Why or why not?
Coupon
A coupon or coupon payment is the annual interest rate paid on a bond, expressed as a percentage of the face value and paid from issue date until maturity. Coupons are usually referred to in terms of the coupon rate (the sum of coupons paid in a...