As a paperboy, I used to receive gold certificates, silver certificates and silver coins from my customers.
I'd estimate they have defaulted on between 30-50% in 1933 with Wilson playing the "turn in your gold before we nearly double the price citizens game" and from 80-90% of the debt already, with the appreciable and exponential rates occurring since Nixon closed the Gold window (ability of foreigners to redeem US$ in gold). in 1971.
All the rest is mop up / sweep up operations to attempt to capture the remaining wealth which escaped transfer.
Reference best I've found to simplify the fiasco orchestrated:
http://www.gold-eagle.com/gold_diges...zzo061308.html
http://www.gold-eagle.com/gold_diges...zzo061708.html
and then:
http://www.321gold.com/editorials/fe...ete032808.html
Namaste!