Ever wonder why you can only search U.S. Federal Census Records up to 1930 so far? The reason is because of privacy! Census cannot be released to the general public until 72 years after the date they were taken. The idea is to protect private information of those still living.
Granted people tend to live longer than 72 years today and so there are still some privacy issues which concern many. But none the less, that's the rule.
And since U.S. Federal census forms are completed every 10 years, the 1930 U.S. Federal Census is the most current record available under the 72-year rule. The 1940 U.S. Census...