In trading on Monday, shares of Spyglass Resources Corp (TSX: SGL.TO) were yielding above the 17% mark based on its monthly dividend (annualized to $0.18), with the stock changing hands as low as $1.01 on the day. Dividends are particularly important for investors to consider, because historically speaking dividends have provided a considerable share of the stock market's total return.
In general, dividend amounts are not always predictable and tend to follow the ups and downs of profitability at each company. In the case of Spyglass Resources Corp, looking at the history chart for SGL below can help in judging whether the most recent dividend is likely to continue, and in turn whether it is a reasonable expectation to expect a 17% annual yield.
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The chart below shows the one year performance of SGL shares, versus its 200 day moving average: 
Looking at the chart above, SGL's low point in its 52 week range is $1.01 per share, with $2.14 as the 52 week high point — that compares with a last trade of $1.01.