Table:
text: Historical mortality rates of puerperal fever
Monthly mortality rates for birthgiving women 1841-1849
Puerperal fever 
 mortality rates for birthgiving women at the first clinic at the 
 Vienna General Hospital 
 1841-1849 reported by 
 Semmelweis 
 . He devised and instituted a handwashing policy by mid-May 1847. His employment was terminated March 20, 1849
Month_ Births Deaths Rate_ Sort_restore
Dec 273 8 2.9 84
Jan 283 10 3.5 85
Feb 291 2 0.7 86
Mar 276 0 0.0 87
Apr 305 2 0.7 88
Maj 313 3 1.0 89
Jun 264 3 1.1 90
Jul 269 1 0.4 91
Aug 261 0 0.0 92
Sep 312 3 1.0 93
Okt 299 7 2.3 94
Nov 310 9 2.9 95
Dec 373 5 1.3 96
Jan 403 9 2.2 97
Feb 389 12 3.1 98
Mar 406 20 4.9 99

Question: How many grading values are associated with 389 births in Historical Mortality Rates from Postpartum Fever?