pre_text: The following table summarizes the activity related to stock options during the year ended December 31, 2019 As of December 31, 2019, the Company had $1,641 of unrecognized stock-based compensation expense related to the stock options. This cost is expected to be recognized over a weighted-average period of 2.5 years. (Dollars in thousands, except per share amounts)
table: Number of Shares Weighted-Average Exercise Price Weighted Average Remaining Contractual Life (in years) Aggregated Intrinsic Value (in thousands)
table: Stock options outstanding - December 31, 2018 - - -
table: Granted 5,835,724 $0.56
table: Forfeited or expired (20,000) $0.55
table: Stock options outstanding - December 31, 2019 5,815,724 $0.56 9.6 years $2,725
table: Stock options exercisable - December 31, 2019 137,500 $0.55 9.6 years $66
question: Analyse this data from a financial earnings document. What is the average number of stocks outstanding as at December 31, 2018 and 2019?