Lopez Plastics Co. (LPC) issued callable bonds on January 1, 2021. LPC's accountant has projected the following amortization schedule from issuance until maturity:

Date	Cash interest			Effective interest			Decrease in balance			Outstanding balance
1/1/2021										$	207,020
6/30/2021	$	7,000		$	6,211		$	789			206,230
12/31/2021		7,000			6,187			813			205,417
6/30/2022		7,000			6,163			837			204,580
12/31/2022		7,000			6,137			863			203,717
6/30/2023		7,000			6,112			888			202,829
12/31/2023		7,000			6,085			915			201,913
6/30/2024		7,000			6,057			943			200,971
12/31/2024		7,000			6,029			971			200,000

What is the annual effective interest rate on the bonds?