FRED
Deferred and Unpaid Life Insurance Premiums Held by the Top 1% (99th to 100th Wealth Percentiles) (WFRBLT01025) - [link]
https://fred.stlouisfed.org/graph/fredgraph.png?g=NRh0
Life Insurance Companies, General Accounts; Deferred and Unpaid Life Insurance Premiums; Asset, Level (DULIPLBSHNO)