Grandpa deposits 1,000 yuan in the bank for a period of 3 years. After maturity, the total principal and interest are 1156.6 yuan. What is the annual interest rate for these three years?
爷爷将1000元钱存入银行，定期3年，到期后共有本金和利息1156.6元，这三年的定期年利率是多少？
<gadget id="calculator">1_156.6 - 1_000</gadget>
<output>156.6</output>

<gadget id="calculator">156.6 / 1_000 / 3</gadget>
<output>0.0522</output>

<result>0.0522</result>