Just to add to azraeil's comments, i think it depends on your discipline. I heard for certain disciplines which are the "hot cake" in the industry at the moment, calls/emails from recruiters start to pour in even if you have like 3-4 years experience. These are niche areas where even people with 3-4 years experience are hard to scout and the gap between the juniors and the seniors are widening as there aren't anyone in that category to fill in the void. However, at the end of the day, it all boils down to what you have been building on throughout that 3-4 years..in short, solid experience counts!