Company X has 15 million shares outstanding on January 1, 2014. They issue 2 million more shares on April 1, 2014 and 3 million more shares on October 1, 2014. Calculate the weighted average shares outstanding during the year.

1. 16.83 million shares
2. 17.25 million shares
3. 18.50 million shares
4. 20.00 million shares