when you first heard the outbreak of covid-19 in Jan 22, 2020, in fear of the spreading of the fatal virus, you decide to buy a 10 years Treasury note. YTM of available 10-year Treasury note was around 1.70% (annualized rate), with coupon rate of 1.12% (annualized rate). Coupon is paid every 6 months. 6 months later the YTM of the same bond drops to 0.64% (right before the first coupon payment). Assuming the maturity date of the bond you invested is Jan. 22, 2030.

Q: What is the annualized bond rate of return in percentage terms after holding the bond for 6 months (right before the first coupon payment) ?