basically I need help with these two questions

1) List top five nations world wide that have the most significant software industries in terms of the GDP in percentage contributed by software industry over tota l national GDP?

2) In the US, list top three industries who are most software related and list their GDP values and in percentage over total US GDP?
for #1 im not even sure where to find this info, I checked BEA but the site is confusing at best