About $15 trillion or 75 times the Bitcoin market cap is currently tied up in negative yielding bonds
Source: https://cointelegraph.com/news/time-for-plan-says-vaneck-exec-as-negative-yield-bonds-hit-27
‘Time for Plan ₿,’ Says VanEck Exec as Negative Yield Bonds Hit $15 Trillion
August 15, 2019
CoinTelegraph