What is the percentage of sterile white men ages 30-40 in the united states?

Here are some ...: Roughly, some 10-15% of couples may not have pregnancy in 1 year under unprotected sexual intercourse. As to white men's infertility I couldn't remember if there has been any specific discussion in professional conference or publication over the past 4-5 decades. So, in reality, do semen analysis to define the quality & quantity of sperms in semen, with an ejaculated semen after 2/3-day abstinence