64.1% of presale Ether accounts never accessed before

Total presale accounts:
= 8,890
= never accessed + accessed
= 5,698 (64.1%) + 3,192 (35.9%)
Total presale ether:
= 60,108,506.26 ether
= never accessed + accessed
= 30,792,269.227 (51.2%) + 29,316,237.033 (48.8%)

account accessed = having at least 1 outgoing transaction
first accessed = date of 1st transaction, can be incoming or outgoing
ether in accounts = balance at genesis

ether never accessed = sum of balance at genesis of accounts that have no outgoing transaction

All presale accounts are separated into 5 categories (x-axis) according to their purchase size.

The Ethereum Frontier release (30 July 2015) is the first time the ether sold in the public sale could be used. Before this, there were 9 proof of concept (POC) testnets released following the release of the whitepaper in November 2013. To achieve a public release for Frontier, the team has chosen to use the hash of block 1,028,201 (palindrome prime number) in the testnet as an input to determine the release timing of Frontier. The block was mined and shortly after Frontier was launched.

More information:
1. Interactive charts and raw data
https://slacknation.github.io/medium/002/
2. launch annonucement
https://blog.ethereum.org/2015/07/27/final-steps/