Decrypting first 100+ bitcoin blocks

Has anybody tried to decrypt the outputs of the first 100 blocks in bitcoin aside from the 'genesis' block where Satoshi mentions NY times article. I have looked at pretty much all outputs from the genesis block to block 70 (and at some random blocks afterwards) just from curiosity and found that blocks 6-11 each have one symbol in the output in this order:

#+,46;

Later block 14 has this string:

<

and block 15 this one:

>

I would imagine these strings just mean less than (). Later on, blocks 20-24 again contain one symbol each in this order:

%01?A

blocks 30-37:

!)68GMPW

blocks 45-57:

!$07:DVabstz

I tried decoding, but couldn't find anything, has anybody tried decoding these? Could it mean something or are these just random tests maybe even randomly generated symbols?