Aloha,

The chance depends on so many variables it's barely even worth considering if you're not planning to spend at least week researching it. As with any event, the chance of it occuring is completely dependent on your current situation. A statistic like that is of very little value as it is at best just the number of people in the world divided by the number of people in the world struck by lightning per year. The measurements of which are also highly unreliable..

That said, take a look at How Likely Are You to Be Struck by Lightning?.

Aloha