Jan ( N = 520 )
Feb ( N = 418 )
Mar ( N = 453 )
Apr ( N = 500 )
May ( N = 473 )
Jun ( N = 276 )
Jan ( N = 527 )
Feb ( N = 492 )
Mar ( N = 522 )
Apr ( N = 510 )
May ( N = 527 )
Jun ( N = 510 )
Jul ( N = 524 )
Aug ( N = 525 )
Sep ( N = 507 )
Oct ( N = 525 )
Nov ( N = 508 )
Dec ( N = 524 )
Jan ( N = None )
Feb ( N = None )
Mar ( N = None )
Apr ( N = 221 )
May ( N = 499 )
Jun ( N = 510 )
Jul ( N = 513 )
Aug ( N = 510 )
Sep ( N = 504 )
Oct ( N = 527 )
Nov ( N = 493 )
Dec ( N = 526 )
