Coles Group Ltd (ASX: COL) shares have delivered some benchmark beating returns over the past year. And they've paid out some handy passive income to boot.

Shares in the S&P/ASX 200 Index (ASX: XJO) supermarket giant closed on Friday trading for $21.73 apiece.

How does that compare to the share price 12 months ago?

Let's find out!

How much did a $10,000 investment in Coles shares grow in a year?

One year ago, you could have bought Coles shares for $16.79 apiece. Meaning you could have bought 595 shares for $10,000, with enough change left over for a few wings at KFC.

At Friday's closing price, those shares were worth $12,929.35. (The chicken wings, by now, would be long gone.)

But let's not forget that passive income.

If you'd bought Coles stock 12 months ago, you would have received 69 cents a share in fully franked dividends as well. That sees the ASX 200 supermarket giant trading on a fully franked trailing dividend yield of 3.2%.

Now, let's assume you spent those dividends, or tucked them under your mattress, rather than reinvesting them.

So, if we add that 69 cents back into Friday's closing price of $21.73, then the accumulated value of the Coles shares you bought a year ago for $16.79 each is now worth $22.42. Meaning your $10,000 investment for 595 shares is now valued at $13,339.90.

Or a tidy gain of 33.4%, with some potential tax benefits from those franking credits.

What's the latest from the ASX 200 stock?

The last price sensitive news to impact Coles shares was the company's third quarter update, released on 30 April.

For the three months to 31 March, sales revenue increased by 3.4% year on year to $10.38 billion.

And customers continued to flock to Coles' online shopping offer. The company reported eCommerce sales of $1.1 billion for the quarter, up 25.7% year on year. eCommerce sales penetration reached an 11.3% share of supermarket sales.

Coles also opened two new supermarkets during the March quarter.

Commenting on the results, Coles CEO Leah Weckert said, "These results reflect the continued investments we are making in value and in improving the shopping experience for our customers both in store and online."

Weckert added:

This period also marked our first quarter where we were able to fully operate both our Automated Distribution Centres and our Customer Fulfilment Centres, underpinning improved efficiency and delivering enhanced product availability.

Amid high investor expectations, Coles shares closed down 0.8% on the day the company reported.