*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970011002
1970002002
1971001001
1972002002
1973001001
1974001001
1975004004
1976002002
1977005005
1978002002
1979006006
1980004004
1981000000
1982005005
1983002002
1984003003
1985013004
1986101002
198703140017
198802190021
198901280029
199022260030
1991616130035
199211911000202
199326131400629
19941131518001334
19954101817001039
19960118112001193
199718132000834
199818791100891
199901601100171
20003103313001049
200119251500941
200228902200914
200309513100982
20041116418001183
200512853900325
200617834400828
20072134065001407
200805265700583
200901067400180
2010248220600690
2011027014400414
201214011400416
2013149711500613
2014144812100570
201505330038
201601580023
2017030003
Total351634012570017632