If you use a narrow definition of “Orthodox” (for example, man always covers his head even at work, married women likewise – perhaps including refraining from discussing secular business and politics and Shabbos), and then use a broad definition of Hareidim (holds that if halacha conflicts with Israeli law, which includes orders in the army, halacha must be followed at all all times) – then I wouldn’t be surprised is 80% of “Orthodox” are “Hareidi”.
But if you include as Orthodox people who merely refuse to go to work on Shabbos and don’t do malachos on Shabbos, hold by checking ingedients not just checking hechsherim, wear a yarmulke only for davening, etc.) and limit Hareidim to those who refuse to participate in any aspect of the secular economy, insist on dressing in a way that isolates them from the rest of the world, etc. – the the Hareidi percentage falls.