use YAML qw(Dump);

print Dump($stat);

---
CpuStats:
  cpu:
    idle: 100.00
    iowait: 0.00
    nice: 0.00
    system: 0.00
    total: 0.00
    user: 0.00
  cpu0:
    idle: 100.00
    iowait: 0.00
    nice: 0.00
    system: 0.00
    total: 0.00
    user: 0.00