Amazon.com Incorporated reported the following stock price at the beginning of each year since $2012.$ Using $2012$ as the base year, develop a simple index for stock prices.

Year Stock Price to Open Year

$2012$ $ $175\mathrm{.}89$

$2013256\mathrm{.}08$

$2014398\mathrm{.}80$

$2015312\mathrm{.}58$

$2016656\mathrm{.}29$

$2017757\mathrm{.}92$

$20181,172\mathrm{.}00$

$20191,465\mathrm{.}20$

$20201,875\mathrm{.}00$

$20213,270\mathrm{.}00$

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What is the percentage increase in price over the $10-$year period?

Note: Round your answers to $2$ decimal places.