It grew by nearly $100 billion on last day of fiscal year, According to Treasury Direct it grew by $1.64 Trillion in the last year. Date Debt Held by the Public Intragovernmental Holdings Total Public Debt Outstanding 09/29/2010 8,963,900,445,439.19 4,502,371,965,926.43 13,466,272,411,365.62 09/30/2010 9,022,808,423,453.08 4,538,814,607,438.71 13,561,623,030,891.79