I have had better than 50% first year bloom, I am averaging about 70%. That said, I have a much smaller amount that bloom again in their second year. Those that have been around a long time always bloom every year, but that has not been the case for the new ones **. Owyhee Desert may be a slow grower, but blooms every year. Coal Seams and Slew O' Gold are following that trend. But my other TB's? I haven't figured out the Magic to make them predictable bloomers.
** this does not apply to my dwarfs that really really like to bloom and do every year.