According to Wikipedia, angioplasty was first described in 1964 by Dr. Charles Dotter and successfully used in a clinical setting in 1977 by Dr. Andreas Gruentzig. It was widely seen as a much less invasive and traumatic alternative to bypass surgery.
We first regularized collection of data on angioplasties with our 1994 Hospital Discharge Survey , published as Advance Data #278, October 3, 1996. That report gives the number of angioplasties performed in the US short-stay hospitals as 428,000. 2004 Hospital Discharge Survey data, published as Advance Data #371 on May 4, 2006, reflects the increasing popularity of the procedure. In 2004, 664,000 procedures were performed.
Over time the number of angioplasties have increased.
A study in Health Affairs gives more detail on the use of angioplasty.