I agree with tireguy that the RIAA data is potentially questionable, particularly on SACD and DVD-A.
I don't fully get how DVD-A is bigger and growing faster than SACD when in fact, from my ongoing anaysis of online stores (Acoustic Sounds, Amazon, Musicdirect etc.) shows about a 6:1 availability of SACD titles to DVD-A titles. In fact there appears to be more new LP's released weekly than new DVD-A's.
To answer the original question, though I do not see how you will make it statistically relevant, unless you consolidate the data (which would be interesting!):
CD: 500
SACD: 60
DVD-A: 8
LP: 50
DVD-V: 500
I don't fully get how DVD-A is bigger and growing faster than SACD when in fact, from my ongoing anaysis of online stores (Acoustic Sounds, Amazon, Musicdirect etc.) shows about a 6:1 availability of SACD titles to DVD-A titles. In fact there appears to be more new LP's released weekly than new DVD-A's.
To answer the original question, though I do not see how you will make it statistically relevant, unless you consolidate the data (which would be interesting!):
CD: 500
SACD: 60
DVD-A: 8
LP: 50
DVD-V: 500