No release of EIP Addresses

salt-cloud.log

[INFO    ] Starting new HTTPS connection (1): ec2.us-west-2.amazonaws.com
[DEBUG   ] "GET /?Action=AllocateAddress&Domain=vpc&Version=2014-10-01 HTTP/1.1" 400 None
[DEBUG   ] AWS Response Status Code: 400
[ERROR   ] AWS Response Status Code and Error: [400 400 Client Error: Bad Request] {'Errors': {'Error': {'Message': 'The maximum number of addresses has been reached.', 'Code': 'AddressLimitExceeded'}}, 'RequestID': 'e18da542-482d-4854-bdb7-a6c6a4e70d40'}

Profile description:
nat-gateway-primary:
  provider: aws-uswest2
  availability_zone: us-west-2a
  del_root_vol_on_destroy: True
  rename_on_destroy: True
  ssh_username: ec2-user
  extends: base-ec2-uswest2a-linux
  image: ami-xxx
  size: t2.micro
  private_key: /srv/etc/.ssh/mykey.pem
  keyname: mykey.pem.pub
  iam_profile: NATProxyRole
  network_interfaces:
    - DeviceIndex: 0
      PublicIpAddresses:
        - Primary: True
      AssociatePublicIpAddress: True
      allocate_new_eip: False
      SubnetId: subnet-xxx
      SecurityGroupId: sg-xxx
      SourceDestCheck: False
  tag: {'Monitored': 'Yes', 'Role': 'nat'}