Where can I find statistics about the effectiveness of offline advertising for online sales or conversions?

Thanks for the invitation, but I really don't know

Agreed with Mr. Nasir Hussain      Thank You. 

You can check 

www.hubspot.com/marketing-statistics

https://www.cmocouncil.org/facts-stats-categories.php?view...marketing 

https://moz.com/blog/how-to-track-online-roi-of-offline-advertising