*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19700010108109
1970000044
1971000099
1972001078
1973000088
1974001067
1975000099
197600201416
197700201416
197800301114
197900301518
198000201820
198100301720
198200301922
198300101516
198400002121
198500311721
198603602231
1987011202437
198801502329
198914902034
199018712037
1991281801745
1992271002241
19934112322565
199441853028103
1995274032678
19961104012072
1997183403174
19982213302581
19991111202549
20003104003891
2001182703268
20021115421886
200352183328140
2004018125129173
200513355134124
200652675232140
200732285237149
2008214138727188
2009129101120152
2010132132228195
2011034193037264
201202885143157
20130159324114
2014121361160
201503260029
2016009009
2017002002
Total4544316863310483255